HELPPPP

A student dissolves 0.03450 mol of solid salt in 49.83 g of distilled water and observes the temperature of the water rise from 25.2˚C to a final temperature of 31.4˚C. If the calorimeter constant is 37.4 J/˚C, what is the calculated enthalpy of the reaction of the salt in units of kJ/mol? Explain how you would go about solving the problem and show all work for each step in your solution.

Answer:

H20 oxygen 17 8 0 gyjhf I'd

The longest wavelength of a photon that has enough energy to cause the photodissociation of the weakest bond in a peroxyacyl nitrate molecule is approximately 590 nm.

Given the weakest bond in Peroxyacyl nitrate is N-O bond.

The standard bond-dissociation energy of N-O = 201 kJ mol−1

Let the wavelength = l

We know that E = h c / λ, where E is the energy in joules, h is Planck's constant, c is the speed of light, and λ is the wavelength of photons

[tex]E = (6.626 * 10^{-34}) * (3 * 10^8) / \lambda[/tex]

λ =  [tex](6.626 * 10^{-34}) * (3 * 10^8)/201 kJ mol^{-1}[/tex]

λ = 590nm

In order for photodissociation to occur, the photon must have enough energy to break the N−O bond in the nitrate functional group of the molecule. All of the energy of the photon is efficiently used for the photodissociation.

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The condensed structural formula of the compound is;

(CH3)3CCH2CH(CH2CH3)CH2CH2CH(CH3)(CH2CH3)

The functional groups in norethynodrel are;  ketone, alcohol and alkyne

The condensed structure of an organic compound is a simplified representation of the molecular structure of the compound that uses brackets and symbols to indicate the arrangement of atoms in the molecule.

In a condensed structure, the individual atoms are not explicitly shown, and the bonds between them are indicated by lines.

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Answer:

The molecular formula of X = C4 h8 O

The percent yield for the reaction of a sample of 0.49 g of carbon dioxide was obtained by heating 1.22 g of calcium carbonate is 92.4%

Given the mass of carbon dioxide ([tex]CO2[/tex]) = 0.49g

The mass of calcium carbonate ([tex]CaCO3[/tex]) = 1.22g

The reaction is as follows:

[tex]CaCO3(s) -- > CaO(s)+CO2(s)[/tex]

As we see 1 mole of CaCO3 is required to produce 1 mole of [tex]CO2[/tex]

The molar mass of calcium carbonate, = 100.09 g/mol.

The molar mass of given carbon dioxide = 44g

mass of [tex]CaCO3[/tex] used = number of moles x molar mass = 1 * 100 = 100g

Mass of [tex]CO2[/tex] produced = 1 * 44 = 44g

Here for 100g of [tex]CaCO3[/tex] 44g of [tex]CO2[/tex] is produced.

Then for 1.22g of [tex]CaCO3[/tex] = 44 * 1.22/100 = 0.53g of [tex]CO2[/tex] is produced.

But the actual yield of carbon dioxide is 0.49 g

The percent yield is calculated by dividing the actual yield by the theoretical yield and multiplying by 100.

percent yield = 0.49/0.53 * 100 = 92.4%

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The symbol of the ion is U 2+

U represents the element uranium, and

the superscript 2+ indicates that charge

The atomic number (Z) of an element represents the number of protons found in the nucleus of an atom. In a neutral atom, the number of electrons is equal to the number of protons. However, in an ion, the number of electrons can differ from the number of protons.

To find the symbol for an ion with 87 electrons and a Z of 89, we need to determine the charge on the ion. The charge on an ion is equal to the difference between the number of protons and the number of electrons. In this case, we have:

charge = Z - number of electrons

charge = 89 - 87

charge = +2

Therefore, the ion has a charge of +2. The symbol for this ion can be written as follows:

U 2+

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Explanation:

The amount of heat required to melt a solid substance is given by the formula:

Q = m * ΔHf

where Q is the amount of heat required, m is the mass of the substance, and ΔHf is the heat of fusion of the substance. The heat of fusion of ethanol is 111.3 J/g.

So, for melting 148 g of solid ethanol, the amount of heat required is:

Q1 = 148 g * 111.3 J/g = 16499.6 J

The amount of heat required to raise the temperature of the liquid ethanol from -26.8°C to its melting point of -114.1°C is given by the formula:

Q2 = m * C * ΔT

where Q2 is the amount of heat required, m is the mass of the substance, C is its specific heat capacity, and ΔT is the change in temperature.

The specific heat capacity of ethanol is 2.44 J/g°C. The change in temperature is:

ΔT = (-114.1°C) - (-26.8°C) = -87.3°C

Since we want to bring the ethanol to its melting point, we assume that it is still in the liquid state. Therefore, we use the specific heat capacity of liquid ethanol for this calculation.

So, for raising the temperature of 148 g of liquid ethanol from -26.8°C to -114.1°C, the amount of heat required is:

Q2 = 148 g * 2.44 J/g°C * (-87.3°C) = -30834.8 J

Note that the negative sign indicates that heat is lost from the ethanol as it cools.

The total amount of heat required to melt 148 g of solid ethanol and bring it to a temperature of -26.8°C is the sum of Q1 and Q2:

Qtotal = Q1 + Q2 = 16499.6 J + (-30834.8 J) = -14335.2 J

The answer is -14335 J (rounded to three significant digits), which means that 14335 J of heat energy must be removed from the system (or the surroundings must supply 14335 J of heat energy) to carry out the process as described.

Sulfur dioxide decomposition's balanced chemical equation is 2 SO2(g) 2 S(s) + 3 O2 (g). 200.00 g of solid sulphur would result from 25.0 g of sulphur dioxide.

In order to compute the mass of oxygen that will react or the mass of 02 that will react with aluminium, multiply the molar mass of oxygen molecules, 0.69 mol two, by 32 g per mole. Hence, the answer is that 25 g of aluminium and 22.22 g of cobalt will react.

First, we must determine how many moles of sulphur dioxide are contained in 25.0 g:

Number of moles of SO2 = mass / molar mass

Number of moles of SO2 = 25.0 g / 64.06 g/mol (molar mass of SO2)

Number of moles of SO2 = 0.3904 mol

The number of moles of sulphur produced can then be calculated using the mole ratio between sulphur dioxide and sulphur:

Number of moles of S = 2 x number of moles of SO2

Number of moles of S = 2 x 0.3904 mol

Number of moles of S = 0.7808 mol

Lastly, we may convert the amount of moles to grammes using the molar mass of sulphur:

Mass of S = number of moles x molar mass

Mass of S = 0.7808 mol x 256.53 g/mol (molar mass of S8)

Mass of S = 200.00 g (rounded to two decimal places)

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The metal has a density of 19.3g/mL.

A material's density is determined by how much mass there is in a given volume of that material. We must divide the metal's mass by its volume to determine its density. Density of gold is 19.3 g/mL.Since the volume of the metal is equal to the volume of water it displaced, we can calculate the density of the metal by dividing the mass of the metal (352.3 grams) by the volume of water it displaced (18.0 mL).

Density = [tex]\frac{Mass}{Volume}[/tex]

Density = [tex]\frac{352.3 g}{18.0 mL}[/tex]

Density = 19.3 g/mL

Therefore, the density of the metal is 19.3 g/mL.

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complete question:

She measured the mass of the metal to be 352.3 grams. Then she dropped the metal into a measuring cup and found that it displaced 18.0 mL of water

calculate the density  of metal

densities of some common substances for comparison

Density of water = 1.00 g/mL

Density of air = 1.225 g/mL

Density of iron = 7.86 g/mL

Density of aluminum = 2.7 g/mL

Density of gold = 19.3 g/mL

The molarity of the bleach solution is 0.0635 M.

First we need to know the number of moles of solute (in this case, NaOCI) and the volume of the solution in liters.

First, we need to convert the mass of NaOCI to moles using its molar mass:

molar mass of NaOCI = 23.0 g/mol (for Na) + 16.0 g/mol (for O) + 35.5 g/mol (for Cl) + 1.0 g/mol (for I) = 74.5 g/mol

moles of NaOCI = mass / molar mass = 9.50 g / 74.5 g/mol = 0.127 moles

Next, we need to convert the volume of the solution to liters:

volume = 2,000 ml = 2,000 / 1,000 L = 2.0 L

Now we can calculate the molarity of the solution:

Molarity (M) = moles of solute / volume of solution in liters

M = 0.127 moles / 2.0 L = 0.0635 M

Therefore, the molarity of the bleach solution is 0.0635 M.

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Answer:

1M

Explanation:

To find molarity, we use the formula [tex]\frac{n}{v}[/tex], where n is the moles of solute, and v is the volume in liters.

This formula is fairly straightforward. When we input our values we get a formula of [tex]\frac{0.50 moles}{0.5 liters}[/tex]. Simplifying yields 1M. (Hint: Don't forget that occasionally we do have to convert between units. In this case, the 500mL was converted to liters using the known conversion factor that 1000mL= 1 liter.)

The mass of the nitrogen gas that is found to be produced from the reaction equation is 22.4 g.

A balanced chemical equation is a representation of a chemical reaction using the formulas of the reactants and products, and the coefficients that represent the number of each species involved in the reaction.

The correct equation of the reaction is;

2 NH3 + 3 CuO → 3 Cu + N2 + 3 H2O

Number of moles of CuO consumed = 197g/80 g/mol

= 2.4 moles

Given that;

3 moles of CUO is consumed to give 1 moles of N2

2.4 moles of CUO will give 2.4 * 1/3

= 0.8 moles

Mass of N2 = 0.8 * 28 g/mol

= 22.4 g

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Answer: To convert 350 miles per hour to meters per second, we need to use the following conversion factors:

1 mile = 1609.344 meters

1 hour = 3600 seconds

Therefore, we can write:

350 miles per hour = 350 miles / 1 hour × 1609.344 meters / 1 mile × 1 hour / 3600 seconds

Simplifying the expression, we get:

350 miles per hour = 155.65104 meters per second (rounded to six decimal places)

Therefore, 350 miles per hour is equivalent to 155.65104 meters per second (approximately).

Explanation:

Ethane (C2H6) burns to make dioxide and steam: 2C2H6(g) + 7O2(g) (g) Ethane (C2H6) fires to give methane gas and steam: 4CO2(g) + 6H2O + 2C2H6(g) + 7O2(g) (l)

We must determine the molecules of CO2 and CO2 that were created. According to the equation above, when 2 molecules of Online C 2 H 6 are exposed to oxygen, 4 moles of Carbon dioxide C O 2 are created.

Oxygen gas and ethane (C2H6) react to create both water and carbon dioxide. Find the quantity of carbon dioxide created when the reaction yield is 60% when 5 mol of propane is burnt with 16 molecule of oxygen initially. 2C2H6+7O2→4CO2+6H2O.

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The molarity of a 0.5 liter solution that contains 3.84 moles of NaCl would be 7.68 M.

Molarity is simply the ratio of the number of moles of solutes per liter volume of a solution.

In other words, molarity is a measure of the concentration of a solute in a solution. It is commonly denoted by the symbol "M" and expressed in units of mol/L.

Molarity = mole/volume

Where the volume is in liters.

In this case:

Molarity of the NaCl solution = 3.84/0.5

                                                = 7.68 M

Thus, the molarity of a 0.5 Liter solution that contains 3.84 moles of NaCI is 7.68 M.

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Assuming the volume of the tire remains constant, we can use the ideal gas law to determine the pressure of the tire at the higher temperature:

P1/T1 = P2/T2

where P1 is the initial pressure, T1 is the initial temperature, P2 is the final pressure (what we're trying to find), and T2 is the final temperature.

Converting the temperatures to Kelvin (as the ideal gas law requires temperatures in Kelvin), we have:

P1/T1 = P2/T2

P1 = 2.25 atm

T1 = 20 + 273.15 = 293.15 K

T2 = 45 + 273.15 = 318.15 K

Solving for P2, we get:

P2 = P1(T2/T1)

P2 = 2.25 atm (318.15 K / 293.15 K)

P2 = 2.44 atm (rounded to two significant figures)

Therefore, the pressure in your tires at 45°C would be approximately 2.44 atm.

Esterification is a chemical reaction between an alcohol and a carboxylic acid that results in the formation of an ester and a molecule of water.

Esterification  is an important class of organic reactions and is widely used in the synthesis of flavors, fragrances, and plastics. In this report, we will explore the fundamental principles and practical applications of esterification.

The experimental procedure involves the reaction between methanol and acetic acid to form methyl acetate and water. The reaction was carried out in a round-bottom flask equipped with a condenser and a thermometer. The reactants were mixed in stoichiometric amounts, and a small amount of sulfuric acid was added as a catalyst. The flask was heated using a hot plate and maintained at a constant temperature of 60°C.

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we need to mix 3.68 g of Na2HPO4 and 2.89 g of NaH2PO4 to prepare 1.00 L of a buffer with a total phosphate concentration of 0.0500 M and a pH of 7.45.

pH = pKa + log([base]/[acid])

Substituting the values:

7.45 = 7.20 + log([Na2HPO4]/[NaH2PO4])

0.25 = log([Na2HPO4]/[NaH2PO4])

Antilog(0.25) = [Na2HPO4]/[NaH2PO4]

1.78 = [Na2HPO4]/[NaH2PO4]

Let x be the amount of Na2HPO4 in moles and y be the amount of NaH2PO4 in moles.

Then:

x + y = 0.0500 (total moles of phosphate)

141.96x + 119.98y = (0.0500)(141.96 + 119.98) (total mass of phosphate)

Solving these equations simultaneously, we get:

x = 0.0259 mol

y = 0.0241 mol

Mass of Na2HPO4 = 0.0259 mol × 141.96 g/mol = 3.68 g

Mass of NaH2PO4 = 0.0241 mol × 119.98 g/mol = 2.89 g

Concentration in chemistry refers to the amount of a substance dissolved in a given volume of a solvent. It is a fundamental concept in chemistry and is used to describe the strength of a solution. The concentration of a solution is usually expressed in terms of the amount of solute present per unit volume of the solution. There are several ways to express concentration, including molarity, molality, mole fraction, and percent by mass or volume.

Molarity is the most commonly used unit of concentration and is defined as the number of moles of solute per liter of solution.  The concentration of a solution plays an important role in determining its properties and behavior. For example, a highly concentrated solution of salt will have a higher boiling point and lower freezing point than a dilute solution. Concentration also affects the rate of chemical reactions, as higher concentrations of reactants typically result in faster reaction rates.

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The growth of coral on objects found at the bottom of the ocean is a physical change, not a chemical change.

This is because the coral is simply attaching itself to the surface of the object through a physical process, rather than changing the chemical composition of the object itself. The coral is able to attach itself to the surface due to physical forces such as adhesion, cohesion, and surface tension.

However, it is worth noting that over time, the growth of coral on an object can lead to chemical changes in the object as the coral secretes calcium carbonate, which can gradually alter the object's composition.

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As HF is hydrogen bonded, it has a highest boiling point of 19 oC or less, when it becomes liquid. The boiling points of the remaining hydrogen halides, which are gaseous, are determined by the van der Waal forces.

Hydrogen fluoride (H 2 F) has a lower boiling point than water (H 2 O) ( ). H2O has a boiling point of 100 °C while only having a boiling point of 5 °C. Despite the fact that water and hydrogen fluoride have stronger hydrogen bonds than each other, water only forms two hydrogen bonds per molecule whereas hydrogen fluoride only forms one.

Furthermore, water creates hydrogen bonds between nearby molecules. The extremely electronegative oxygen on the other molecule interacts with hydrogen. This is a strong type of interaction that takes more energy than dipole-dipole interactions. As a result, water boils at a greater temperature than HCL.

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Answer:

50.0moles

Explanation:

The balanced equation of the reaction is:

2NaOH + H2SO4____ Na2SO4 +2H2O

2moles of NaOH reacted with 1mole of H2SO4

x moles of NaOH will react with 25moles of H2SO4

2moles______1mole

xmoles______25

x=25×2

x=50moles of NaOH

Answer: As the fertilizers enter the water systems, they cause an explosion of growth by algae and aquatic plants. When the organisms die they are decomposed by microbes that quickly deplete the oxygen in water, killing animals such as fish and shellfish.

Explanation: Excess fertilizers lead to "eutrophication".

0.21 moles of S[tex]O_{2[/tex] can be produced by reacting 8 grams of C[tex]S_{2[/tex]

What is Moles?

Mole is a unit of measurement used in chemistry to express the amount of a substance. It is defined as the amount of a substance that contains the same number of entities (such as atoms, molecules, or ions) as there are atoms in 12 grams of carbon-12. This number is known as Avogadro's number

To calculate the number of moles of S[tex]O_{2[/tex] produced, we need to use the balanced chemical equation to determine the mole ratio between C[tex]S_{2[/tex]and S[tex]O_{2[/tex].

The balanced chemical equation is:

C[tex]S_{2[/tex] + 3[tex]O_{2[/tex]→ C[tex]O_{2[/tex] + 2S[tex]O_{2[/tex]

The molar mass of C[tex]S_{2[/tex] is 76.14 g/mol.

First, we need to calculate the number of moles of C[tex]S_{2[/tex] present in 8 grams:

moles of C[tex]S_{2[/tex] = mass / molar mass

moles of C[tex]S_{2[/tex] = 8 g / 76.14 g/mol

moles of C[tex]S_{2[/tex] = 0.105 moles

From the balanced equation, we see that the mole ratio between C[tex]S_{2[/tex]and S[tex]O_{2[/tex] is 1:2. This means that for every 1 mole of C[tex]S_{2[/tex] that reacts, 2 moles of S[tex]O_{2[/tex] are produced.

Therefore, the number of moles of S[tex]O_{2[/tex] produced can be calculated as:

moles of S[tex]O_{2[/tex] = moles of C[tex]S_{2[/tex] × 2

moles of S[tex]O_{2[/tex] = 0.105 moles × 2

moles of S[tex]O_{2[/tex] = 0.21 moles

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HBr has a dipole moment of 7.95debye and an interatomic spacing of 1.94 x 10-om.

HBr (a polar covalent molecule) has a dipole moment () of 0.851D (debye) and a percentage ionic character of 12.6%.

The size of the charge multiplied by the distance between the centres of the positive and negative charges yields a dipole moment. The Greek character " is used to represent it. It is measured in Debye units ('D'). 1 D = 3.33564 10-30 C.m, where C signifies Coulomb and m a metre.

It's 1018 statcoulomb-centimeters. Traditionally, the debye moment was defined as the dipole moment produced by two charges of opposing sign but equal magnitude of 1010 statcoulomb.

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Boyle's Law-

[tex]\:\:\:\:\:\:\:\:\:\:\:\star\:\sf \underline{ P_1 \: V_1=P_2 \: V_2}\\[/tex]

(Pressure is inversely proportional to the volume)

Where-

As per question, we are given that -

Now that we have all the required values and we are asked to find out volume which will be occupied if the pressure is adjusted to 80 KPa and the temperature remains unchanged. For that we can put the values and solve for the final volume of helium-

[tex]\:\:\:\:\:\:\:\:\:\:\:\star\:\sf \underline{ P_1 \: V_1=P_2 \: V_2}[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf 100 \times 160 = 80 \times V_2\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf V_2 = \dfrac{100 \times 160}{80}\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf V_2 =100\times \cancel{\dfrac{ 160}{80}}\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf V_2 = 100 \times 2\\[/tex]

[tex] \:\:\:\:\:\:\longrightarrow \sf \underline{V_2 = 200 \:cm^3 }\\[/tex]

Answer:

Explanation:

We can use to convert the given number of atoms of nickel to moles.

1 mole of any element contains 6.022 x 10^23 atoms of the element

So, the number of moles of nickel can be calculated as:

moles of Ni = (number of atoms

moles of Ni = 3.88 x 10^23 / 6.022 x 10^23

moles of Ni = 0.644

Therefore, the answer is option B: 0.644 moles Ni.

According to the given statement the alpha particle's wavelength is 6.48×10⁻¹⁵ meters.

The positively charged alpha particles (α) are created when the nucleus of an atom's two protons as well as two neutrons join forces. Alpha particles are created by the radioactivity of the most dangerous radioactive elements, including uranium, radium, and polonium.

The de Broglie wavelength equation may be used to determine the alpha particle's wavelength:

λ = h / p

where p is the particle's momentum, h is its Planck constant (6.626 * 10⁻³⁴ J s), and is its wavelength.

The mass (m) and velocity (v) of an alpha particle may be used to compute its momentum:

p = m * v

Inputting the values provided yields:

p = (6.70×10⁻²⁷ kg) * (1.52×10⁷ m/s) = 1.02×10⁻¹⁹ kg m/s

Now we can determine the wavelength using this value:

λ = h / p = 6.626 x 10⁻³⁴ J s / 1.02×10⁻¹⁹ kg m/s

λ = 6.48 x 10⁻¹⁵ m

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The complete question is -

Calculate the wavelength of -

An alpha particle (6.70×10⁻²⁷ kg) moving at a speed of 1.52×10⁷ m/s (34000000 miles per hour). What is the m ?