A scuba tank has a pressure of 195 atm at a temperature of 10ºC. The volume of the tank is 350 L. How many moles of air are in the tank?
Answer:
The answer is 2939 moles.
Explanation:
To obtain the moles from these values you should apply the ideal gas formula because in a scuba tank all gas that you have inside is the air:
PV= nRT. (1)
Thus the moles number, n, is:
n = PV/ RT (2)
Where:
P is pressure: 195 atm;
V is volume: 350 L,
R is gas constant: 0,082 atm×L / mol×K
And T is temperature: 10°C, that must be converted in k, thus:
10°C + 273,15 = 283,15 K
Replacing these values in (2) the moles number, n, is:
2939 moles of air
Please indicate which of the compounds will yield postive results for the permanganate, ninhydrin, and ceric ammonium nitrate tests by placing them in the appropriate boxes.
The compounds will yield Positive results for the permanganate, ninhydrin, and ceric ammonium nitrate tests are
permanganate test= ethene,
ninhydrin=aspasyic acid Phenylalanine
ceric ammonium nitrate test= methanol
What is a compound?Generally, A compound is simply defined as a substance made up of two or more different chemical elements held together by chemical bonds that are difficult to break.
In conclusion, For the permanganate test= ethene,
ninhydrin=aspasyic acid Phenylalanine
ceric ammonium nitrate test= methanol
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Mussels need both Ca2+ and CO32- to make their shells. The data showed that the ocean Ca2+ has not changed, so Ca2+ is not the problem.
To determine the CO32- concentration in the ocean, we can use the DIC measurement and the ocean’s pH.
Use the reaction equation above to answer the question on the relationship between pH and CO32- concentration.
Would a decrease in pH mean an increase or decrease in CO32- concentration?
Answer: Decrease
"Carbon dioxide reacts with seawater to form carbonic acid, which releases hydrogen ions, reducing pH"
Sourced from https://yaleclimateconnections.org/2008/06/covering-ocean-acidification-chemistry-and-considerations/
So basically the ocean is absorbing the CO32- and that lowers the pH as well lowers the amount of CO32- readily available.
This is all I could find on this subject though ;'(
What is the purpose of adding base in the aldol condensation reaction? choose the best answer.
Base is used in aldol condensation reaction
because it is an organic reaction to form enolate ion, the OH bond present in base help to remove Acidic hydrogen of enolate ion.
Please Please Please help + show the work please! :)
Find the number of grams 9.30 x 10^-3 mole of SmO
Molar mass of SmO or sodium methylate is 160g/mol
Now
No of moles =Given mass /Molar massGiven mass
No of moles ×Molar mass9.3×10^{-3}×1601.488gConsider an atom having four distinct energy levels. If an electron is able to make transitions between any two levels, how many different wavelengths of radiation could the atom emit?.
Energy levels are the electron shells where electrons are found at a fixed distance from the nucleus of the atom. The atom could emit 6 different wavelengths.
What is wavelength?
A wavelength is a distance between the adjacent crests in wave signals propagated in a system. Wavelength [tex](\rm \lambda )[/tex] is in inverse relation to the frequency of the wave.
When an electron jumps from energy level 1 to 2, 1 to 3, and 1 to 4 one wavelength each is present. Hence, making the total wavelength to be 3, in transition from the first energy level.
Similarly, from energy levels, 2 to 3 and 2 to 4, a total of 2 wavelengths, and from energy levels 3 to 4 one wavelength is produced.
So the total different wavelengths of the radiation that can be emitted will be 3 + 2 + 1 = 6.
Therefore, 6 different wavelengths of radiation will be emitted by the atom.
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Calculate the pH of a solution with [H+] = 5.6 x 10^-8
Answer:
Approximately [tex]7.25[/tex].
Explanation:
If the concentration of [tex]{\rm H^{+}}[/tex] ions in a solution is [tex]x\; {\rm M}[/tex], the [tex]{\rm pH}[/tex] of that solution would be [tex](-\log_{10}(x))[/tex].
Note that the base of the logarithm in this calculation should [tex]10[/tex]. One way to be sure is to state the base explicitly. Using the change of base rule of logarithms:
[tex]\begin{aligned}-\log_{10}(x) = -\frac{\ln(x)}{\ln(10)}\end{aligned}[/tex].
In this question, it is implied that the concentration of [tex]{\rm H^{+}}[/tex] in the given solution is [tex]5.6 \times 10^{-8}\; {\rm M}[/tex], such that [tex]x = 5.6 \times 10^{-8}[/tex]. Using the equations above:
[tex]\begin{aligned}& \text{pH of this solution} \\ =\; & -\log_{10}(x) \\ =\; & -\frac{\ln(x)}{\ln(10)} \\ =\; & -\frac{\ln(5.6 \times 10^{-8})}{\ln(10)} \\ \approx\; & 7.25\end{aligned}[/tex].
what was happening to the H20 when the lines on the graph were mostly flat? What kind of energy was being added to the system?
Answer: A heating curve graphically represents the phase transitions that a substance undergoes as heat is added to it.
The plateaus on the curve mark the phase changes. The temperature remains constant during these phase transitions.
Water has a high boiling point because of the strong hydrogen bonds between the water molecules; it is both a strong hydrogen bond donor and acceptor.
The first change of phase is melting, during which the temperature stays the same while water melts. The second change of phase is boiling, as the temperature stays the same during the transition to gas
Explanation:
That's latent heat of vaporization.
Water boils at 100°CThe graph increases still 100°Conce it reaches boiling point it yields a straight line because of latent heat after all molecules are evaporated then the graph rises backThere is a bell at the top of a tower that is 45m high. The bell weighs 190N (N=Newtons). The bell has potential energy. The formula for Potential energy is PE = mgh or mass x gravity x height. Gravity is 9. 8 m/s^2. What is the bell’s potential energy?
Since the bell weighs 190 N and is 45 m high, the bell’s potential energy is 8550 J
To answer the question, we need to know what potential energy is.
What is potential energy?This is energy due to position. It is given by PE = mgh where
m = mass, g = acceleration due to gravity and h = height of object.Also, W = mg = weight of object.
So, PE = Wh
The bell's potential energyNow, given that the bells weight 190 N and is 45 m high,
W = 190 N and h = 45 m.So, PE = Wh
= 190 N × 45 m
= 8550 Nm
= 8550 J
So, the bell’s potential energy is 8550 J
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Which molecule is hexanal?
Answer:is A.
Explanation:Because six carbon straight chain aldehyde it is clear liquid with an atomspheric pressure boiling point of 131 degree Celsius.
A 1 liter solution was diluted to a molarity of 2 M by bringing the volume up to 4 liters. What was the initial molarity of the solution?
Answer:
8.0 mol/L
Explanation:
To do this problem you need to use C₁V₁=C₂V₂. C=concentration and V=volume. (Note: you dont want to use M₁V₁=M₂V₂ because this is measuring mass not concentration).
So, V₁= 1.0L
C₂=2 Mol/L
V₂= 4 L
C₁ is unknown.
you would plug this equation in like this:
(C₁)(1.0 L)=(2.0 Mol/L)(4.0L).
Do algebra to get C₁ alone.
C₁=[tex]\frac{(2.0 mol/L)(4.0L)}{1.0L} =8.0 mol/L[/tex]
The liters cancel out and you are left with mol/L or M
I hope this helps! good luck :)
A gas sample has a volume of 30.0 mL at a pressure of 1.53 atm. If the volume increases to 50.1 mL and the temperature remains constant, the new pressure in atms will be
At constant temperature, if the volume of the sample of gas increases to the given value, the pressure decreases to 0.92atm.
Boyle's lawBoyle's law simply states that "the volume of any given quantity of gas is inversely proportional to its pressure as long as temperature remains constant.
Boyle's law is expressed as;
P₁V₁ = P₂V₂
Where P₁ is Initial Pressure, V₁ is Initial volume, P₂ is Final Pressure and V₂ is Final volume.
Given the data in the question question;
Initial volume of the gas V₁ = 30.0mL = 0.03LInitial pressure of the gas P₁ = 1.53atmFinal volume of the gas V₂ = 50.1mL = 0.0501LFinal pressure of the gas P₂ = ?We substitute our given values into the expression above to determine the new pressure.
P₁V₁ = P₂V₂
P₂ = P₁V₁ / V₂
P₂ = ( 1.53atm × 0.03L ) / 0.0501L
P₂ = 0.0459Latm / 0.0501L
P₂ = 0.92atm
Therefore, at constant temperature, if the volume of the sample of gas increases to the given value, the pressure decreases to 0.92atm.
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what is the least measurement of black hole,
Answer:
Here is the correct answerblack hole in ourter space for the first time the scientific research
and development of the following layers lethargic
Explanation:
STUDY CORRECTION.
1. Given the following reaction, answer the questions that follow:
C3H8+5 02
3 CO₂ + 4H₂O
a) If you begin with 3.5 moles of C3H8 and 6.2 moles of O₂, find the moles of carbon dioxide produced_
b) Find the mass of CO₂ produced using your work in step (a) above.
Answer:
See below
Explanation:
From the equation you can see 5 mole O2 results in 3 moles CO2
( this is the limiting reagent because C3H8 : O2 is 1:5)
6.2 / 5 * 3 = 3.72 moles CO2 produced
CO2 weighs ~ 44 gm/mole 44 gm/mole * 3.72 mole = 163.68 gm of CO2
The atomic symbol superscript 206 subscript 82 upper p b. represents lead-206 (pb-206), an isotope that has 82 protons and 124 neutrons. which atomic symbol could represent an isotope that undergoes radioactive decay to produce pb-206? superscript 238 subscript 92 upper u. superscript 222 subscript 87 upper p b superscript 178 subscript 72 upper h f. superscript 192 subscript 77 upper p b.
Answer: The atomic symbol represent an isotope that undergoes radioactive decay to produce Pb-206 can be, Polonium (Po).
Please answer this question for me
Answer:
True.
Explanation:
Ternary acids end in -ic if the polyatomic anion ends in -ate.
5. How much water would need to be added to 750 mL of a 2.8 M HCl solution to
make a 1.0 M solution?
6. If I add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be?
7. If I add water to 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL, what will the molarity of the diluted solution be?
8. How much 0.05 M HCl solution can be made by diluting 250 mL of 10 M HCl?
9. I have 345 mL of a 1.5 M NaCl solution. If I boil the water until the volume of the solution is 250 mL, what will the molarity of the solution be?
10.
How much water would I need to add to 500 mL of a 2.4 M KCl solution to make a 1.0 M solution
please help me
The values of molarity and volumes for the given questions are 2,100 mL, 0.75 M, 0.1 M, 50,000 mL, 2.07 M and 1,200 mL respectively.
What is the relation between the molarity & volume of solution?Relation between the molarity and volume of the solution will be shown by the following equation:
M₁V₁ = M₂V₂, where
M₁ & V₁ is the molarity and volume of one solution whereas M₂ & V₂ are the molarities and volume of the another solution.
Required volume of water needed to add at 750 mL of a 2.8 M HCl solution to make a 1.0 M solution will be calculated by using the above formula:V₂ = (750)(2.8) / (1) = 2,100 mL
Required molarity of diluted solution obtained on adding 25 mL of water to 125 mL of a 0.15 M NaOH solution will be calculated by using the above formula:M₂ = (0.15)(125) / (25) = 0.75 M
Required molarity of diluted solution obtained on adding 100 mL of a 0.15 M NaOH solution until the final volume is 150 mL will be calculated by using the above formula:M₂ = (100)(0.15) / (150) = 0.1 M
Required volume of HCl of 0.05M HCl can be made by diluting 250 mL of 10 M HCl will be calculated by using the above formula:V₂ = (10)(250) / (0.05) = 50,000 mL
Molarity of the resultant solution is:M₂ = (1.5)(345) / (250) = 2.07 M
Required volume of water to add on KCl solution is:V₂ = (2.4)(500) / (1) = 1,200 mL
Hence required values of molarity and volume are 2,100 mL, 0.75 M, 0.1 M, 50,000 mL, 2.07 M and 1,200 mL respectively.
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PLEASE HELP ASAP
More info on picture.
This relationship is known as Graham's Law of Effusion. How many times heavier is the heavy gas compared to the light gas?
(In 3a and 3b the heavy gas took 118 seconds while the light gas took 41 seconds)
Answer:
A box of ideal gas has consists of light particles and heavy particles (the heavy ones have 16 times the mass of the light ones).
how many grams of methane will you have from 3 moles of Sodium Acetate
Answer:
roughly about 246.1?
Explanation:
The phosphorus atom in pcl3 would be expected to have a:.
The phosphorus atom in Phosphorus trichloride (PCl₃) would be expected to have a partial positive charge.
What is a partial positive charge?A molecule has a partial positive charge when it presents differences in electric charges along the molecule.
A molecule that has a partial positive charge is said to be polar because can generate polar bonds.
Moreover, phosphorus trichloride (PCl₃) is a molecule that forms a colorless substance used in the inorganic chemistry industry.
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What is the mass of 3.01 x 10^23 atoms of copper
Answer: There are 31.8 grams of copper.
Explanation:
Describe the importance of plaster of paris
Answer:
plaster is important because of the many uses you can make out of plaster
How many grams of NaCl required to form a 500ml solution with a molarity of 0. 5M , the molar mass of NaCl is 58. 5g/mol?
Answer:
14.625 gm
Explanation:
(x / 58.5 gm) / (500ml /1000 ml) = .5 x = 14.625 gm
Which acid/base pair will give an equivalence point that cannot be predicted solely by a general knowledge of acid and base strength
The acid/base pair that give equivalence point that Cannot be predicted by general knowledge is NaOH and HCI ONH.
What is an Acid and base?An Acid is a substances that is corrosive in nature and turn blue lithmus paper to red which it react with base to produce salt and water.
Acid dissolve metals.
Base is a substance that turn red lihthmus paper to blue and react with acid to produce salt and water.
Therefore, The acid/base pair that give equivalence point that Cannot be predicted by general knowledge is NaOH and HCI ONH.
The question is incomplete as the options were not given. The options were gotten from another website.
Select the correct answer below:
ONaOH and HCI ONH,
HC ONH, and CH, COOH
NaOH and Christmas, COOH
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A 2.0 l container of oxygen had a pressure of 3.2 atm. what volume would be necessary to decrease the pressure to 1.0 atm? use the formula: p1v1 = p2v2 0.625 l 0.64 l 6.4 l 64 l
The volume that would be necessary to decrease the pressure to 1.0 atm is mathematically given as
v2=6.4l
What volume would be necessary to decrease the pressure to 1.0 atm?Question Parameter(s):
A 2.0 l container of oxygen had a pressure of 3.2 atm
Generally, the equation for the is mathematically given as
P1v1=p2v2
Therefore
v2=piv1/p2
v2=2*3.2/1
v2=6.4l
In conclusion, the volume is
v2=6.4l
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Answer:
CExplanation:
I have two solutions : solution A has 6 moles of solute in 2 L of solvent; solution B has 6 moles of solute in 1 L of solvent . Which one is more concentrated ?
Answer:
Many people have a qualitative idea of what is meant by concentration. Anyone who has made instant coffee or lemonade knows that too much powder gives a strongly flavored, highly concentrated drink, whereas too little results in a dilute solution that may be hard to distinguish from water. In chemistry, the concentration of a solution is the quantity of a solute that is contained in a particular quantity of solvent or solution. Knowing the concentration of solutes is important in controlling the stoichiometry of reactants for solution reactions. Chemists use many different methods to define concentrations, some of which are described in this section.
Molarity
The most common unit of concentration is molarity, which is also the most useful for calculations involving the stoichiometry of reactions in solution. The molarity (M) is defined as the number of moles of solute present in exactly 1 L of solution. It is, equivalently, the number of millimoles of solute present in exactly 1 mL of solution:
molarity=molesofsolutelitersofsolution=mmolesofsolutemillilitersofsolution(4.5.1)
(4.5.1)molarity=molesofsolutelitersofsolution=mmolesofsolutemillilitersofsolution
The units of molarity are therefore moles per liter of solution (mol/L), abbreviated as MM . An aqueous solution that contains 1 mol (342 g) of sucrose in enough water to give a final volume of 1.00 L has a sucrose concentration of 1.00 mol/L or 1.00 M. In chemical notation, square brackets around the name or formula of the solute represent the molar concentration of a solute. Therefore,
[sucrose]=1.00M(4.5.2)
(4.5.2)[sucrose]=1.00M
is read as “the concentration of sucrose is 1.00 molar.” The relationships between volume, molarity, and moles may be expressed as either
VLMmol/L=L(molL)=moles(4.5.3)
(4.5.3)VLMmol/L=L(molL)=moles
or
VmLMmmol/mL=mL(mmolmL)=mmoles(4.5.4)
(4.5.4)VmLMmmol/mL=mL(mmolmL)=mmoles
Figure 4.5.14.5.1 illustrates the use of Equations 4.5.34.5.3 and 4.5.44.5.4 .
alt
Figure 4.5.14.5.1 : Preparation of a Solution of Known Concentration Using a Solid Solute
Example 4.5.14.5.1 : Calculating Moles from Concentration of NaOH
Calculate the number of moles of sodium hydroxide (NaOH) in 2.50 L of 0.100 M NaOH.
Given: identity of solute and volume and molarity of solution
Asked for: amount of solute in moles
Strategy:
Use either Equation 4.5.34.5.3 or Equation 4.5.44.5.4 , depending on the units given in the problem.
Solution:
Because we are given the volume of the solution in liters and are asked for the number of moles of substance, Equation 4.5.34.5.3 is more useful:
molesNaOH=VLMmol/L=(2.50L)(0.100molL)=0.250molNaOHmolesNaOH=VLMmol/L=(2.50L)(0.100molL)=0.250molNaOH
Exercise 4.5.14.5.1 : Calculating Moles from Concentration of Alanine
Calculate the number of millimoles of alanine, a biologically important molecule, in 27.2 mL of 1.53 M alanine.
If the concentrations of a weak acid and its conjugate base are increased from 0.1 M and 0.05 M, respectively, to 0.2 M and 0.1 M, the solution's buffer capacity will _________.
If we increase the concentrations of a weak acid and its conjugate base by the amounts shown, the buffer capacity will remain the same.
What is buffer capacity?The term buffer capacity is generally used to describe how much of the acid or base that can be neutralized by a buffer before there can be a change in the pH.
In this case, if we increase the concentrations of a weak acid and its conjugate base by the amounts shown, the buffer capacity will remain the same.
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What is a commission?
A.
taking control of a situation
B.
a military unit
C.
a legal organization
D.
assigned to supervise soldiers
Answer:
B. a military unit
Explanation:
Which two factors must be considered when predicting whether two substances will dissolve in each other?
A. number of bonds and size of the molecules
B. number of bonds and molecular shape
C. type of bonds and size of the molecules
D. type of bonds and molecular shape
The two factors must be considered when predicting whether two substances will dissolve in each other are type of bonds and size of the molecules are two factors.
What is solubility?Solubility is the ability of solute particles to dissolve in any solvent, and solubility is directly proportional to the dissolving ability of the solute.
Solubility of any substance depends on the type of the bond present in the solute molecule i.e. polar or non polar. And it is also depends on the size of the solute as size defines the surface tenssion of the substance.
Number of bonds and shape of molecules are also define the solubility but not at that extent as their type and shape.Hence type of bonds and size of the molecules are two factors.
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How many moles of water are produced from the following reaction, when 275 kJ of energy is given off?
4 NH3 + 3 O2 → 2 N2 + 6 H2O ΔH = -1530 kJ
The moles of water are produced from the given reaction, when 275 kJ of energy is given off is 1.08 moles.
How do we calculate moles of water?The mole (symbol mol) is the SI base unit of material quantity. The amount of substance in an object or sample is a measure of how many elementary entities of a certain substance are present.
Given chemical reaction is:
4NH₃ + 3O₂ → 2N₂ + 6H₂O
From the stoichiometry of the reaction it is clear that 6 moles of water molecule is produced.
Actual moles will be calculated by using the enthalpy and energy value as:
Actual moles of H₂O = 275kJ × (6 mol H₂O)/1530kJ) = 1.08 moles.
Hence required moles of H₂O is 1.08 moles.
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