Rounded to the nearest whole number, y is 42. Therefore, the molecular formula of the hydrocarbon is C4H42.
To find the molecular formula of the hydrocarbon, we first need to determine the molecular weight. We know that the mass ratio between hydrogen and carbon is 1:10, which means that for every 1 gram of hydrogen, there are 10 grams of carbon in the molecule.
Let's assume that we have x number of carbon atoms and y number of hydrogen atoms in the molecule. The molecular weight can then be expressed as:
Molecular weight = (x x atomic weight of carbon) + (y x atomic weight of hydrogen)
Since the mass ratio between hydrogen and carbon is 1:10, we can write:
y = 10x
Now, we can substitute y in the equation for molecular weight:
Molecular weight = (x x atomic weight of carbon) + (10x x atomic weight of hydrogen)
Molecular weight = x(atomic weight of carbon + 10 x atomic weight of hydrogen)
We also know that one liter of hydrogen at 127°C and 1 atm pressure weighs 2.8 g. Using the ideal gas law, we can calculate the number of moles of hydrogen in one liter:
PV = nRT
n = PV/RT
n = (1 atm x 1 L) / (0.0821 L.atm/mol.K x 400 K)
n = 0.0305 mol
The molecular weight of the hydrocarbon can be calculated as follows:
Molecular weight = 2.8 g / 0.0305 mol
Molecular weight = 91.80 g/mol
Now, we can solve for x in the equation for molecular weight:
91.80 g/mol = x(12.01 g/mol + 10 x 1.01 g/mol)
91.80 g/mol = 12.01x + 10.10x
91.80 g/mol = 22.11x
x = 4.15
Since x represents the number of carbon atoms in the molecule, we can round it to the nearest whole number, which is 4. Similarly, y can be calculated as:
y = 10x = 41.5
Rounded to the nearest whole number, y is 42. Therefore, the molecular formula of the hydrocarbon is C4H42.
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10. karl is at the gym exercising. after a while on the treadmill, he gets a cramp in his legs. karl blames
lactic acid building up in his muscles. what is the chemical equation for this process?
a. c.h20 -2c,h,o,
b. 2c,h,o, -c,h,206
c. ch2o2ch,oh + 2002
Karl's leg cramp is unlikely to be caused by lactic acid, and the chemical equation for the process he is thinking of is C₆H₁₂O₆ + 2 ATP → 2 C₃H₃O₃⁻ + 2 NADH, option B is correct.
Karl's assumption that lactic acid is responsible for his leg cramp is a common misconception. In reality, lactic acid is a byproduct of anaerobic respiration, which occurs when there is not enough oxygen available to support aerobic respiration.
The process of glycolysis, which is the breakdown of glucose to pyruvate with the help of ATP. This process occurs in the cytoplasm of cells and is the first step in cellular respiration. The two pyruvate molecules produced by glycolysis can then be further broken down in the mitochondria to produce ATP through aerobic respiration, option B is correct.
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The complete question is:
Karl is at the gym exercising. After a while on the treadmill, he gets a cramp in his legs. Karl blames lactic acid building up in his muscles. What is the chemical equation for this process?
A) C₆H₁₂O₆ + 2 ADP + 2 Pi → 2 C₃H₆O₃ + 2 ATP
B) C₆H₁₂O₆ + 2 ATP → 2 C₃H₃O₃⁻ + 2 NADH
C) C₃H₃O₃⁻ + CoA + NAD+ → Acetyl-CoA + CO₂ + NADH
D) Acetyl-CoA + 3 NAD+ + FAD + GDP + Pi → 2 CO₂ + 3 NADH + FADH₂ + GTP
The tripeptide ،
Ala-Arg_Asp
contains four ionizable groups with 9. 8, and 10. 5. Calculate the pI for this molecule
The correct answer is C. 7.0. The isolectric point for this molecule is 7.0.
First, list the pka states that the tripeptide glycylarginylglutamate which can be found
pKa_1 = 2.1
pKa_2 = 4.1
pKa_3 = 9.8
pKa_4 = 12.5
The tripeptide, Ala-Arg_Asp. The three peptide bonds that are derived from the three amino acids are called tripeptides. A few examples of tripeptides are glutathione, Eisenin, GHK-Cu, etc. tripeptides are most commonly used for improving the look of ageing signs in the skin. Now it is necessary to find the isoelectric point (pI)
pl = SUM(pKa_1 + ... + pka_n)/n
pl = (2.1 + 4.1 + 9.8 + 12.5)/4
pl = 7.1 which is approximately 7.0.
The isolectric point for this molecule is 7.0.
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Complete question-
The tripeptide glycylarginylglutamate contains four ionizable groups with pKas of 2.1, 4.1 9.8, and 12.5. Calculate the pI for this molecule.
A. 3.1
B. 6.4
C. 7.0
D. 8.3
E. 7.3
Find the mass of 50% CaCO3 which will produce
136 g of CaSO4? (Molar mass of CaCO3 = 100 g;
Molar mass of CaSO4 = 136 g)
CaCO3 + H2SO4 → CaSO4 + H2O + CO2
(1) 100 g (2) 200 g
(3) 300 g (4) 400 g
Answer:
Explanation:
From the balanced chemical equation, we can see that one mole of CaCO3 reacts with one mole of CaSO4. Therefore, we can use the molar mass of CaCO3 and the given amount of CaSO4 to calculate the amount of CaCO3 needed, and then convert it to mass.
Number of moles of CaSO4 = Mass / Molar mass
Number of moles of CaSO4 = 136 / 136
Number of moles of CaSO4 = 1
Since the reaction is 1:1, the number of moles of CaCO3 required is also 1. Therefore, we can use the molar mass of CaCO3 to calculate the mass required:
Mass of CaCO3 = Number of moles x Molar mass
Mass of CaCO3 = 1 x 100
Mass of CaCO3 = 100 g
Therefore, the answer is (1) 100 g.
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In the following acid-base reaction hpo42- is the_____________
In the following acid-base reaction, hpo₄²⁻ is the base.
This can be seen as it accepts a proton (H⁺) from H₂O to form the conjugate acid, H₂PO₄⁻. The other reactant, H₂O, donates the proton, making it the acid in the reaction. It is important to note that in an acid-base reaction, the species that donates a proton is the acid and the species that accepts the proton is the base.
The strength of the acid and base can also be determined by the equilibrium constant of the reaction. The larger the equilibrium constant, the stronger the acid or base. In this particular reaction, hpo₄²⁻ is a weak base, as it only partially accepts the proton from H₂O.
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The solubility of a gas is 0. 650 g/L at a pressure of 109 kPa. What is the solubility of the gas if the pressure is increased to 131 kPa?
The solubility of the gas increases to 0.780 g/L when the pressure is increased to 131 kPa.
According to Henry's law, the solubility of a gas in a liquid is directly proportional to the pressure of the gas above the liquid. Thus, we can use the following equation to calculate the new solubility:
S₂ ÷ S₁ = P₂ ÷ P₁
where S₁ is the initial solubility, S₂ is the new solubility, P₁ is the initial pressure, and P₂ is the new pressure.
Plugging in the given values, we have:
S₂ ÷ 0.650 g/L = 131 kPa ÷ 109 kPa
Solving for S₂, we get:
S₂ = (0.650 g/L) × (131 kPa ÷ 109 kPa)
S₂ = 0.780 g/L
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write the chemical equation of koh dissociating in a solution to form ions. based on how the chemical dissociates, is koh an acid or a base? explain how you know.
The chemical equation for KOH dissociating in water to form ions is:
[tex]\rm KOH (aq) \rightarrow K^+(aq) + OH^-(aq)[/tex], which shows that KOH is a base.
A chemical equation is an illustration of a chemical reaction's reactants and products.
Equation for the dissociation of KOH:
[tex]\rm KOH (aq) \rightarrow K^+(aq) + OH^-(aq)[/tex]
In the above mentioned reaction, potassium ions ([tex]\rm K^+[/tex]) and hydroxide ions ([tex]\rm OH^-[/tex]) are generated by the dissociation of KOH.
Based on how the chemical dissociates, KOH is a base. This is because it produces hydroxide ions ([tex]\rm OH^-[/tex]) when it dissociates in water. ([tex]\rm OH^-[/tex]) is produced by base in water.Therefore, KOH is a base because it produces hydroxide ions ([tex]\rm OH^-[/tex]) when it dissociates in water.
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A sample of nitrogen gas has a pressure of 6. 00 kpa at 540 K. If the volume does not change, what will the pressure bat at 250. 0 K?
The pressure of the nitrogen gas at 250.0 K will be 2.78 kPa.
To find the pressure of the nitrogen gas at 250.0 K, we will use the combined gas law formula:
P₁/T₁ = P₂/T₂
Where P₁ is the initial pressure (6.00 kPa), T₁ is the initial temperature (540 K), P₂ is the final pressure (which we want to find), and T₂ is the final temperature (250.0 K).
Since the volume does not change, we can use this simplified formula.
Step 1: Rearrange the formula to solve for P₂:
P₂ = (P₁ × T₂) / T₁
Step 2: Plug in the given values and calculate P₂:
P₂ = (6.00 kPa × 250.0 K) / 540 K
Step 3: Calculate P₂:
P₂ = 1500 / 540 = 2.78 kPa (rounded to two decimal places)
So, the pressure of the nitrogen gas at 250.0 K will be 2.78 kPa.
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A 50. 0 ml. Soap bubble is blown at standard pressure. When a thunderstorm passes later in the day, the pressure becomes 700. 0 mmHg. Will the bubble get bigger or smaller? What is its new volume?
The new volume of the soap bubble is approximately 54.29 mL. Since the volume has increased, the bubble will get bigger when the pressure drops to 700.0 mmHg during the thunderstorm.
A 50.0 mL soap bubble is blown at standard pressure. When a thunderstorm passes later in the day, the pressure becomes 700.0 mmHg. To determine if the bubble will get bigger or smaller and to find its new volume, we will use Boyle's Law, which states that P1V1 = P2V2, where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume.
Step 1: Convert the initial and final pressures to the same unit. The standard pressure is 1 atmosphere (atm), which is equivalent to 760 mmHg. The final pressure is given as 700.0 mmHg.
Step 2: Apply Boyle's Law. Let P1 = 760 mmHg, V1 = 50.0 mL, and P2 = 700.0 mmHg. We will solve for V2, the new volume.
760 mmHg * 50.0 mL = 700.0 mmHg * V2
Step 3: Solve for V2.
V2 = (760 mmHg * 50.0 mL) / 700.0 mmHg
V2 ≈ 54.29 mL
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6. a monobasic organic acid x has the composition 31. 6% carbon, 5. 3% hydrogen and 63. 1% oxygen.
a. what is the empirical formula of acid x?
b. an aqueous solution solution contains 11. 4 g of x per dm. 20 cm of this solution required 30
cm² of 0. 100 mol dm naoh for reaction in a titration. calculate the relative molecular mass of
the acid.
A) The empirical formula of acid X is CH2O since it contains 31.6% carbon, 5.3% hydrogen, and 63.1% oxygen, b) the relative molecular mass of acid X is 34.2 g mol⁻¹.
What is empirical formula?An empirical formula is a chemical formula that indicates the simplest, whole number ratio of atoms in a molecule. It shows the types of atoms and the number of each type of atom that make up a single molecule of a compound.
a. The empirical formula of acid X is CH2O since it contains 31.6% carbon, 5.3% hydrogen, and 63.1% oxygen.
b. The number of moles of acid X in 11.4 g of the solution is 11.4/M, where M is the relative molecular mass of acid X. The number of moles of NaOH required to react with this amount of acid X is 0.100 mol dm⁻³ × 30 cm² = 0.03 mol. Thus, the mole ratio of acid X to NaOH is 11.4/M : 0.03, or M : 0.03 × 11.4/M. This can be rearranged to give M = 0.03 × 11.4/M, or M = 34.2 g mol⁻¹. Therefore, the relative molecular mass of acid X is 34.2 g mol⁻¹.
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You have a solution of copper sulfate with a volume of 2 dm3. The concentration of the solution is 12 g/dm3. What is the mass of the copper sulfate?
The mass of copper sulfate in the given solution is 24 grams.
Copper sulfate, also known as cupric sulfate or copper (II) sulfate, is a chemical compound that consists of copper ions and sulfate ions. It has the molecular formula CuSO4 and is commonly used in agriculture, mining, and chemical industries.
In the given scenario, we have a solution of copper sulfate with a volume of 2 dm3 and a concentration of 12 g/dm3. This means that for every 1 dm3 of the solution, there are 12 grams of copper sulfate present. To find the mass of copper sulfate in the entire 2 dm3 solution, we can use the following formula:
Mass = Concentration x Volume
Substituting the given values, we get:
Mass = 12 g/dm3 x 2 dm3
Mass = 24 g
Therefore, the mass of copper sulfate in the given solution is 24 grams.
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A sample of river water taken near to a factory
shows a pH of 5.
al Do you think this represents a pollution
problem? Give reasons for your answer.
b What other evidence might you need to
consider before reaching a conclusion?
a) A pH of 5 for river water near a factory does suggest a potential pollution problem. The normal pH range for most natural waters is around 6.5-8.5. pH values below 6.5 can indicate acidification, which can be caused by pollutants such as sulfur dioxide and nitrogen oxides from industrial activities, or from natural sources such as acid rain.
What is the river water about?A pH of 5 is more acidic than most natural waters and could indicate the presence of acidic pollutants in the water.
Therefore, in terms of b) Other evidence that would be useful to consider before reaching a conclusion about whether the pH of 5 represents a pollution problem includes:
Information about the specific factory located near the river and the activities that take place there. This could help to identify any potential sources of pollutants that could be causing the decrease in pH.Water quality testing for other parameters such as dissolved oxygen, temperature, and nutrient levels. This could help to identify other potential sources of pollution, and could help to determine the overall health of the river ecosystem.A comparison of the pH of the river water at different times of year, and at different locations along the river. This could help to identify any seasonal or regional patterns in the pH levels, which could be related to natural factors such as rainfall or the geology of the area.Read more about river water here:
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Given 425.0 mL of a gas at 12.0 °C. What is its volume at 6.0 °C?
The volume of the gas at 6.0 °C is 416.8 mL.
What is Charles Law?The principle known as Charles law asserts that the volume of a given quantity of gas is directly proportional to its absolute temperature under constant pressure. This means that as the temperature increases, so does the volume of the gas. Conversely, when the temperature decreases, so does the volume. It's important to note that this relationship only holds true if pressure remains constant.
Equation:Using Charles law
V1/T1 = V2/T2
Where:
V1 = initial volume of gas
T1 = initial temperature of gas
V2 = final volume of gas
T2 = final temperature of gas
Converting the initial and final temperatures from Celsius to Kelvin
T1 = 12.0 + 273.15 = 285.15 K
T2 = 6.0 + 273.15 = 279.15 K
Plugging in the values
V1/T1 = V2/T2
425.0 mL / 285.15 K = V2 / 279.15 K
V2 = (425.0 mL / 285.15 K) * 279.15 K
V2 = 416.8 mL (rounded to three significant figures)
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What mass of LiOH would need to be dissolved in water to make 300. 0 mL of a solution with a pH of 11. 25
We need to dissolve 0.0405 mg mass of LiOH in 300.0 mL of water to get a solution with a pH of 11.25.
To find the mass of LiOH needed to make the solution, we need to first calculate the concentration of hydroxide ions in the solution using the pH value. Since pH = 11.25, the [OH⁻] concentration can be found by taking the negative logarithm of 11.25 and converting it to the concentration scale.
[tex][OH^-] = 10^{-11.25} = 5.62 \times 10^{-12} \, \text{M}[/tex]
Since LiOH is a strong base, it will dissociate completely in water, so the amount of LiOH needed can be calculated using the stoichiometry of the balanced equation:
LiOH + H₂O → Li⁺ + OH⁻ + H₂O
Thus, 1 mole of LiOH produces 1 mole of OH⁻. To achieve a concentration of 5.62 x 10⁻¹²M, we need 5.62 x 10⁻¹² moles of LiOH per mL of solution. Therefore, for 300.0 mL of solution, the number of moles of LiOH needed is:
[tex]\[5.62 \times 10^{-12} \, \text{mol/mL} \times 300.0 \, \text{mL} = 1.69 \times 10^{-9} \, \text{mol}\][/tex]
The molar mass of LiOH is 23.95 g/mol, so the mass of LiOH needed is:
1.69 x 10⁻⁹ mol x 23.95 g/mol = 4.05 x 10⁻⁸ g or 0.0405 mg (to 4 significant figures).
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The period of a simple pendulum of length 1m on a massive planet is 1 sec. What is the acceleration due to gravity on that planet?
The acceleration due to gravity on the massive planet is 39.48 m/s².
How do we calculate?The period (T) of a simple pendulum is given by:
T = 2π√(L/g),
where L is the length of the pendulum and g is the acceleration due to gravity.
In this scenario, we are given that the period of the pendulum (T) is 1 second and the length of the pendulum (L) is 1 meter.
So, substituting these values into the equation:
1 = 2π√(1/g)
Simplifying this equation :
g = (4π²) / (1²)
g = 4π² m/s²
g ≈ 39.48 m/s²
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Complete the balanced molecular reaction for the following weak acid with a strong base: HNO2(aq) + Ca(OH)2 (aq) ->
Correct answer should be 2 HNO2(aq) + Ca(OH)2(aq) -> 2 H2O(l) + Ca(NO2)2(aq).
Why?
The balanced molecular reaction for the reaction between HNO₂ and Ca(OH)₂ is:
2HNO₂(aq) + Ca(OH)₂(aq) -> 2H₂O(l) + Ca(NO₂)₂(aq)
The balanced molecular reaction for the combination of a weak acid with a strong base involves the neutralization reaction between the acid and the base. In this case, the weak acid is nitrous acid (HNO₂) and the strong base is calcium hydroxide (Ca(OH)₂).
When the two compounds are mixed together, the hydroxide ions (OH⁻) from the base react with the hydrogen ions (H+) from the acid to form water. However, since nitrous acid is a weak acid, it only partially dissociates in water to form hydrogen ions and nitrite ions (NO₂⁻). Therefore, the reaction requires the use of two molecules of HNO₂ to react with one molecule of Ca(OH)₂.
Thus balanced equation for the reaction is:
2HNO₂(aq) + Ca(OH)₂(aq) -> 2H₂O(l) + Ca(NO₂)₂(aq)
This means that two molecules of HNO₂ react with one molecule of Ca(OH)₂ to produce two molecules of water and one molecule of calcium nitrite (Ca(NO₂)₂). The balanced equation shows that the number of atoms of each element is the same on both sides of the equation, which means that the reaction is balanced and follows the law of conservation of mass.
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1. In a purple camote peel soaked with rubbing alcohol overnight and steel wool vinegar supernatant liquid. What is the explanation of the reaction or result when you add 2 teaspoons of supernatant liquid in the purple camote peel extract soaked with rubbing alcohol?
2. In flower alcoholic extract, bougainvillea petal soaked with rubbing alcohol overnight. What is the explanation of the reaction or result when you add 2 teaspoons of supernatant liquid in the flower alcoholic extract?
The reaction that takes place when 2 teaspoons of supernatant liquid is added to the purple camote peel extract soaked with rubbing alcohol overnight is the formation of a purple pigment.
The purple pigment is created when the alcohol and steel wool vinegar react with the camote peel extract to break down the cell walls and release the pigment. This reaction is further enhanced by the addition of the supernatant liquid, which helps to dissolve the pigment and make it more easily visible.
The reaction that takes place when 2 teaspoons of supernatant liquid is added to the flower alcoholic extract of bougainvillea petal soaked with rubbing alcohol overnight is the formation of a pinkish-red pigment.
The pinkish-red pigment is created when the alcohol and steel wool vinegar react with the petal extract to break down the cell walls and release the pigment. This reaction is further enhanced by the addition of the supernatant liquid, which helps to dissolve the pigment and make it more easily visible.
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17. saccharin, an artificial sweetener that is 3000 times sweeter than sucrose, is composed of
45.90% carbon, 2.73% hydrogen, 26.23% oxygen, 7.65% nitrogen, and 17.49% sulfur. is the molecular formula of saccharin (a) c14h10o6n2s2, (b) csh,ons, (c) c&h9o2ns, and following orition: com 12.0%
(d) c;h5o3ns?
Saccharin, an artificial sweetener that is 3000 times sweeter than sucrose, is composed of a) C₁₄H₁₀O₆N₂S₂.
45.90% carbon, 2.73% hydrogen, 26.23% oxygen, 7.65% nitrogen, and 17.49% sulfur. is the molecular formula of saccharin.
To determine the molecular formula of saccharin, we first need to calculate the empirical formula using the given percentages of each element.
Assuming we have 100 grams of saccharin, we have:
Carbon: 45.90 g / 12.01 g/mol = 3.82 mol
Hydrogen: 2.73 g / 1.01 g/mol = 2.70 mol
Oxygen: 26.23 g / 16.00 g/mol = 1.64 mol
Nitrogen: 7.65 g / 14.01 g/mol = 0.55 mol
Sulfur: 17.49 g / 32.07 g/mol = 0.55 mol
We can divide each value by the smallest one, which is 0.55 mol, to get the following ratios:
Carbon: 3.82 / 0.55 = 6.95
Hydrogen: 2.70 / 0.55 = 4.91
Oxygen: 1.64 / 0.55 = 2.98
Nitrogen: 0.55 / 0.55 = 1
Sulfur: 0.55 / 0.55 = 1
The resulting ratios are close to whole numbers, so we can assume the empirical formula to be C₇H₅NO₃S. To find the molecular formula, we need to determine the actual molecular mass of saccharin.
The empirical formula mass of C₇H₅NO₃S is approximately 183 g/mol. The molecular mass of saccharin is known to be around 452 g/mol, so we can calculate the ratio of the molecular mass to the empirical formula mass:
452 g/mol / 183 g/mol = 2.47
This means that the molecular formula is 2.47 times the empirical formula, or:
C₇H₅NO₃S * 2.47 = C₁₇H₁₃N₂O₅S
Therefore, the molecular formula of saccharin is (a) C₁₄H₁₀O₆N₂S₂. The other options (b) CSH,ONS, (c) C&H₉O₂NS, and (d) C;H₅O₃NS are not correct.
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Determine the formula of the hydrated salt with iron 20. 14%, oxygen 23. 02%,sulphur11. 51%,water 45. 32% and molecular mass ofsalt is278
To determine the formula of the hydrated salt, we need to first find the empirical formula by determining the smallest whole number ratio of the elements present in the compound.
Then, we can use the molar mass of the empirical formula and the percentage composition of the water to find the molecular formula.
Step 1: Find the empirical formula
Assuming 100 g of the compound, we can calculate the masses of each element present:
- Iron: 20.14 g
- Oxygen: 23.02 g
- Sulphur: 11.51 g
- Water: 45.32 g
Next, we need to convert these masses to moles:
- Iron: 20.14 g / 55.85 g/mol = 0.360 mol
- Oxygen: 23.02 g / 16.00 g/mol = 1.439 mol
- Sulphur: 11.51 g / 32.06 g/mol = 0.359 mol
- Water: 45.32 g / 18.02 g/mol = 2.515 mol
We can then divide each mole value by the smallest mole value to get the mole ratio:
- Iron: 0.360 mol / 0.359 mol ≈ 1
- Oxygen: 1.439 mol / 0.359 mol ≈ 4
- Sulphur: 0.359 mol / 0.359 mol = 1
- Water: 2.515 mol / 0.359 mol ≈ 7
The mole ratio is approximately 1:4:1:7, which gives us the empirical formula:
FeSO4·7H2O
Step 2: Find the molecular formula
The empirical formula mass of FeSO4·7H2O is:
(55.85 + 32.06 + 4(16.00)) + 7(18.02) = 278.00 g/mol
We know from the problem that the molecular mass of the salt is 278 g/mol, so the empirical formula is also the molecular formula. Therefore, the formula of the hydrated salt is FeSO4·7H2O.
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Question 1 (2 points)
2. 5 L of a gas is heated from 200 K to 300 K. What is the final volume of the gas?
The final volume of the gas can be determined using the ideal gas law, which states that pressure multiplied by volume is equal to the number of moles of a gas multiplied by the gas constant and the temperature (PV=nRT).
Since the pressure is constant, the final volume can be determined by simply calculating the ratio of the final temperature (300 K) over the initial temperature (200 K). Thus, the final volume of the gas would be 5L x (300/200) = 7.5L.
This is based on the assumption that the ideal gas law holds true, meaning that the gas particles are well separated, the forces between them are negligible, and the volume occupied by the gas particles is negligible.
This equation works well for most gases at relatively low pressures and temperatures, but it fails to accurately describe some gases in extreme conditions.
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How much heat in calories is needed to raise the temp of 125. 0g of lead (Clead=0. 130J / g Celsius) from 17. 5 Celsius to 41. Q Celsius
Approximately 91.2 calories of heat are needed to raise the temperature of 125.0g of lead from 17.5°C to 41.0°C.
To calculate the heat in calories needed to raise the temperature of 125.0g of lead from 17.5°C to 41.0°C, we'll use the specific heat formula and convert Joules to calories. The formula is:
q = m * C * ΔT
where q represents the heat absorbed, m is the mass of the substance (in grams), C is the specific heat capacity (in J/g°C), and ΔT is the change in temperature (in °C).
Step 1: Calculate the change in temperature (ΔT).
ΔT = Final temperature - Initial temperature
ΔT = 41.0°C - 17.5°C
ΔT = 23.5°C
Step 2: Use the specific heat formula.
q = m * C * ΔT
q = 125.0g * 0.130J/g°C * 23.5°C
q = 381.625J
Step 3: Convert Joules to calories.
1 calorie = 4.184 Joules
q = 381.625J / 4.184J/cal
q ≈ 91.2 calories
So, approximately 91.2 calories of heat are needed to raise the temperature of 125.0g of lead from 17.5°C to 41.0°C.
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Complete the following reaction
a. HN03 + KOH -->. +.
b. HCl + LiOH -->. +.
c. H2S + NaOH -->. +
a. HNO3 + KOH --> KNO3 + H2O
b. HCl + LiOH --> LiCl + H2O
c. H2S + 2NaOH --> Na2S + 2H2O
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Identify each bond between the component atoms as sigma bonds (single bonds), one sigma bond and one pi bond (double bonds), or one sigma bond and two pi bonds (triple bonds)
In general, there are three types of bonds: sigma bonds (single bonds), one sigma bond and one pi bond (double bonds), and one sigma bond and two pi bonds (triple bonds).
Sigma bonds are the simplest type of covalent bond, formed by the direct overlap of atomic orbitals between two component atoms. These bonds result in a strong, stable connection and are typically found in single bonds.
In double bonds, there is one sigma bond and one pi bond between the component atoms. The sigma bond is formed as mentioned earlier, while the pi bond results from the sideways overlap of p orbitals, creating a bond above and below the sigma bond plane.
This combination of bonds leads to a shorter and stronger connection between the atoms compared to a single bond.
Lastly, in triple bonds, there is one sigma bond and two pi bonds between the component atoms.
The sigma bond is formed in the same manner as single and double bonds, while the two pi bonds occur when two sets of p orbitals overlap perpendicularly to each other, with one set above and below, and the other set in front and behind the sigma bond plane.
This configuration leads to an even shorter and stronger bond compared to double bonds.
To identify the bond types between component atoms, you will need to examine the molecular structure and electron sharing between the atoms involved. Count the number of shared electron pairs to determine if it's a single (sigma), double (sigma and pi), or triple bond (sigma and two pi bonds).
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Viewing the moon on the 7th day of the lunar cycle, what percentage of the the lunar surface would be illuminated?
a. 17%
b. 35%
C. 45%
Viewing the moon on the 7th day of the lunar cycle, 35% of the the lunar surface would be illuminated.
The moon is in its first quarter phase on the seventh day of the lunar cycle, which makes it seem as a half-circle in the sky. This occurs because the sun's surface is lighted exactly 50% of the time at this time.
The moon's other half was still completely opaque. Different regions of the moon will be illuminated on any given day depending on the moon's phase, which changes over the course of the lunar cycle.
On the seventh day of the cycle, when the moon will be in its first quarter phase, just half of the lunar surface will be fully illuminated by the sun.
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Using the following balanced equation, how many moles of NaCl can be produced from 0.314 moles of Na3PO4?
equation : 3 FeCl2 + 2 Na3PO4 6 NaCl + Fe3(PO4)2
Answer: 0.942 moles of NaCl
Explanation:
for every 2 moles of Na3PO4 that react, 6 moles of NaCl form
therefore, to find how many moles of NaCl for we use this formula:
0.314 moles Na3PO4 * (6/2) = 0.942 moles of NaCl
Select the correct answer.
where are globular clusters usually found?
oa. disk
ob. nucleus
oc. interstellar space
od. halo
Globular clusters are usually found in the halo of a galaxy. The answer is d.
Globular clusters are dense, spherical collections of stars that orbit a galactic center. They are typically composed of tens of thousands to hundreds of thousands of stars and are some of the oldest known objects in the universe.
Globular clusters are usually found in the halo of a galaxy, which is the outermost region of a galaxy that surrounds the disk.
This is because they are thought to have formed early in the history of the galaxy, when the halo was still being formed.
In contrast, stars in the disk of a galaxy are typically younger and more spread out, with less dense collections of stars. The nucleus of a galaxy is the central region, which usually contains a supermassive black hole and dense concentrations of stars.
Therefore, the correct answer is d. halo.
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Who was the first person that was to attend to arrange the element in what year
It is unclear which specific element you are referring to in your question. However, if we are talking about the periodic table of elements, the first person to attend to arrange the elements was Dmitri Mendeleev in the year 1869.
Mendeleev was a Russian chemist who noticed patterns in the properties of elements and arranged them in order of increasing atomic weight. He left gaps in his periodic table for elements that had not yet been discovered, and even predicted the properties of these yet-to-be-discovered elements based on their position in the table.
Mendeleev's work revolutionized the field of chemistry and led to a better understanding of the nature of elements and their relationships to one another. Today, the periodic table is an essential tool for scientists and students alike in understanding the properties and behavior of chemical elements.
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Classify each type bifunctional molecule as being a material used in the synthesis of polyesters, nylons, both, or neither.
dialcohol
diester
dinitro
diacid
diamine
diether
Dialcohol and diacid are bifunctional molecules that can be used in the synthesis of polyesters. In a polyester, the dialcohol and diacid react to form an ester bond, resulting in a long chain polymer.
Diesters can also be used in the synthesis of polyesters, as they can be hydrolyzed to form two carboxylic acid groups and two alcohol groups, which can then react to form an ester bond. Therefore, diesters are also a material used in the synthesis of polyesters.
Diamines and diacids can react to form nylon, so they are bifunctional molecules used in the synthesis of nylons. The reaction between a diamine and diacid forms an amide bond, which leads to a long-chain polymer.
Dinitro and diether are bifunctional molecules that are neither used in the synthesis of polyesters nor nylons. Dinitro compounds typically have nitro groups attached to each of the functional groups, making them more reactive and often used as explosives.
Diethers, on the other hand, can be used in organic synthesis as protecting groups for alcohols or carbonyl groups, but they do not have a direct role in the synthesis of polyesters or nylons.
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Part 1. A chemist reacted 15. 0 liters of gas with in the laboratory to form Cl 2 and Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and F 2 +2NaCl Cl 2 +2NaF Part 2. Explain how you would determine the mass of sodium chloride that can react with the same volume of fluorine gas at STP
At 280 K and 1.50 atm, the mass of NaCl required to react with F₂ is 115.83 g; at STP, the mass of NaCl required to react with F₂ is 78.39 g.
Using the ideal gas equation, we will first determine the number of moles in F2:
Volume (V) = 15 L
Temperature (T) = 280 K
Pressure (P) = 1.5 atm
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?
n = PV / RTn = (1.5 × 15) / (0.082 × 280)n = 0.98 moleF₂ + 2NaCl → Cl₂ + 2NaF
From the balanced equation above,
1 mole of F₂ reacted with 2 moles of NaCl.
0.98 mole of F₂ will react with = 0.98 × 2
= 1.96 moles of NaCl
Mole of NaCl = 1.96 moles
Molar mass of NaCl = 58.5 g/mol
Mass of NaCl =?
Mass = mole × molar massMass of NaCl = 1.98 × 58.5Mass of NaCl = 115.83 gB. How to determine mass of NaCl needed at STPAt standard temperature and pressure (STP),
22.4 L = 1 mole of F₂
15 L = 15 / 22.4
15 L = 0.67 mole of F₂
F₂ + 2NaCl → Cl₂ + 2NaF
From the balanced equation above,
1 mole of F₂ reacted with 2 moles of NaCl.
0.67 mole of F₂ will react with = 0.67 × 2 = 1.34 moles of NaCl
Mole of NaCl = 1.34 moles
Molar mass of NaCl = 58.5 g/mol
Mass of NaCl =?
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16. a solution contains 15. 0 g of naoh in 115. 0 ml of h20. the molarity would be:
(1l = 1000 ml)
The molarity of the solution containing 15.0 g of NaOH in 115.0 mL of H₂O is 3.26 M.
To calculate the molarity of the solution, we first need to convert the mass of NaOH and the volume of water to moles and liters, respectively.
First, we need to find the number of moles of NaOH in 15.0 g. The molar mass of NaOH is 40.00 g/mol, so:
15.0 g NaOH x (1 mol NaOH/40.00 g NaOH) = 0.375 mol NaOH
Next, we need to convert the volume of water from milliliters to liters:
115.0 mL H₂O x (1 L/1000 mL) = 0.115 L H₂O
Now we can calculate the molarity of the solution:
Molarity = moles of solute/liters of solution
Molarity = 0.375 mol NaOH / 0.115 L H₂O
Molarity = 3.26 M
Therefore, the molarity of the solution is 3.26 M.
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January 2 is a third quarter moon. What is the approximate date of the next full moon?
The approximate date of the next full moon after January 2 would be around January 9 or 10.
The approximate date of the next full moon after January 2, which is a third quarter moon, can be determined by understanding the lunar cycle. The lunar cycle, also known as the moon's phases, takes approximately 29.5 days to complete.
The cycle starts with the new moon, then progresses through the waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, third quarter, and finally the waning crescent before returning to the new moon.
Since January 2 is a third quarter moon, we can estimate the remaining days in the lunar cycle until the next full moon. The third quarter moon marks the transition from the waning gibbous to the waning crescent phase, which is about 3/4 of the way through the lunar cycle.
From the third quarter moon, there are still the waning crescent, new moon, waxing crescent, first quarter, and waxing gibbous phases to go through before reaching the full moon. These phases take approximately 1/4 of the lunar cycle, which is about 7 to 8 days.
Taking this into consideration, the approximate date of the next full moon after January 2 would be around January 9 or 10.
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