Question 1

Calculate the temperature,in K,of 2.20 moles of gas occupying 3.70 L at 3.12 atm.

Accepted Answer

A)   64.0 K
B)   -209 K
C)   337 K
D)   28.0 K

Question 2

Identify the element or molecule that has the highest diffusion rate.

Accepted Answer

A)   H2
B)   N2
C)   Ar 
D)   Cl2
E)   Rn

Question 3

Determine the density of N2 gas at STP.

Accepted Answer

A)   1.25 g/L
B)   3.50 g/L
C)   0.66 g/L
D)   6.44 g/L
E)   7.50 g/L

Question 4

How many molecules of N2 are contained in a 10.0 L tank at 7.53 atm and 485 K?

Accepted Answer

A)   1.89 × 1024 molecules
B)   1.14 × 1024 molecules
C)   8.32 × 1024 molecules
D)   4.89 × 1024 molecules
E)   3.63 × 1024 molecules

Question 5

Why does the rate of effusion increase with a decrease in the molar mass?

Accepted Answer

The rate of effusion depends on the spee...

Question 6

What is the pressure in a gas container that is connected to an open-end U-tube manometer if the pressure of the atmosphere is 752 torr and the level of mercury in the arm connected to the container is 8.60 cm higher than the level of mercury open to the atmosphere?

Accepted Answer

A)   666 mm Hg
B)   743 mm Hg
C)   761 mm Hg
D)   838 mm Hg

Question 7

Which of the following gas samples would be most likely to behave ideally under the stated conditions?

Accepted Answer

A)   He at STP
B)   CO at 200 atm and 25°C
C)   SO2 at 2 atm and 0 K
D)   Cl2 at 1 atm and -70°C
E)   O2 at 400 atm and 25°C

Question 8

When 15.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

Accepted Answer

A)   0.229 L
B)   0.458 L
C)   5.14 L
D)   10.3 L

Question 9

A 0.529-g sample of gas occupies 125 mL at 60.cm of Hg and 25°C.What is the molar mass of the gas?

Accepted Answer

A)   11 g/mol
B)   81 g/mol
C)   110 g/mol
D)   130 g/mol

Question 10

The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s) + 2 Al(s) + 6 H2O(l) → 2 NaAl(OH) 4(s) + 3 H2(g) 
What is the volume of H2 gas formed at STP when 4.32 g of Al reacts with excess NaOH?

Accepted Answer

A)   2.39 L
B)   3.59 L
C)   5.38 L
D)   5.88 L C

Question 11

Calculate the root mean square velocity of nitrogen molecules at 25°C.

Accepted Answer

A)   729 m/s
B)   515 m/s
C)   149 m/s
D)   297 m/s

Question 12

A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.88 atm.To what temperature must the gas in the syringe be heated/cooled in order to have a volume of 435 mL at 2.50 atm?

Accepted Answer

A)   139 K
B)   572 K
C)   175 K
D)   466 K
E)   721 K

Question 13

In Lhasa,Tibet,the elevation is 12,000 feet.The altimeter reading in an airplane is 19.00 in Hg.This pressure is equal to ________ torr.

Accepted Answer

A)   9.33
B)   483
C)   0.635
D)   1.57
E)   23.1

Question 14

The mole fraction of argon in dry air near sea level is 1.819 × 10-5 where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________%.

Accepted Answer

A)   7.23 × 10-5
B)   1.819 × 10-5
C)   9.09 × 106
D)   1.819 × 10-3
E)   9.09 × 10-5 D

Question 15

Give the definition for diffusion.

Accepted Answer

A)   gas molecules mix equally
B)   gas molecules spread out in response to a concentration gradient
C)   gas molecules escape from a container into a vacuum through a small hole
D)   average distance between collisions
E)   gas molecules mix unequally

Question 16

How many grams of NO gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

Accepted Answer

A)   13.9 g
B)   32.5 g
C)   417 g
D)   2.47 × 104 g

Question 17

A sample of 0.400 moles of nitrogen occupies 0.800 L.Under the same conditions,what number of moles occupies 1.200 L?

Accepted Answer

A)   0.600 moles
B)   0.417 moles
C)   2.40 moles
D)   0.216 moles

Question 18

Identify the element or molecule that has the lowest effusion rate.

Accepted Answer

A)   He 
B)   N2
C)   NO2
D)   Cl2
E)   Xe

Question 19

To what volume will a 2.33 L sample of gas expand if it is heated from 30.0°C to 300.0°C?

Accepted Answer

A)   4.41 L
B)   23.3 L
C)   0.233 L
D)   1.23 L
E)   0.812 L A

Question 20

The volume of a gas is inversely proportional to the pressure of a gas is known as

Accepted Answer

A)   Avogadro's Law.
B)   Ideal Gas Law.
C)   Charles's Law.
D)   Boyle's Law.
E)   Dalton's Law.

Exam 5: Gases

Calculate the temperature,in K,of 2.20 moles of gas occupying 3.70 L at 3.12 atm.

Correct AnswerverifiedShow Answer

Identify the element or molecule that has the highest diffusion rate.

Correct AnswerverifiedShow Answer

Determine the density of N2 gas at STP.

Correct AnswerverifiedShow Answer

How many molecules of N2 are contained in a 10.0 L tank at 7.53 atm and 485 K?

Correct AnswerverifiedShow Answer

Why does the rate of effusion increase with a decrease in the molar mass?

Correct AnswerverifiedThe rate of effusion depends on the spee...View AnswerShow Answer

What is the pressure in a gas container that is connected to an open-end U-tube manometer if the pressure of the atmosphere is 752 torr and the level of mercury in the arm connected to the container is 8.60 cm higher than the level of mercury open to the atmosphere?

Correct AnswerverifiedShow Answer

Which of the following gas samples would be most likely to behave ideally under the stated conditions?

Correct AnswerverifiedShow Answer

When 15.0 g of zinc metal reacts with excess HCl,how many liters of H2 gas are produced at STP?

Correct AnswerverifiedShow Answer

A 0.529-g sample of gas occupies 125 mL at 60.cm of Hg and 25°C.What is the molar mass of the gas?

Correct AnswerverifiedShow Answer

The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s) + 2 Al(s) + 6 H2O(l) → 2 NaAl(OH) 4(s) + 3 H2(g) What is the volume of H2 gas formed at STP when 4.32 g of Al reacts with excess NaOH?

Correct AnswerverifiedC

Calculate the root mean square velocity of nitrogen molecules at 25°C.

Correct AnswerverifiedShow Answer

A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.88 atm.To what temperature must the gas in the syringe be heated/cooled in order to have a volume of 435 mL at 2.50 atm?

Correct AnswerverifiedShow Answer

In Lhasa,Tibet,the elevation is 12,000 feet.The altimeter reading in an airplane is 19.00 in Hg.This pressure is equal to ________ torr.

Correct AnswerverifiedShow Answer

The mole fraction of argon in dry air near sea level is 1.819 × 10-5 where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________%.

Correct AnswerverifiedD

Give the definition for diffusion.

Correct AnswerverifiedShow Answer

How many grams of NO gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

Correct AnswerverifiedShow Answer

A sample of 0.400 moles of nitrogen occupies 0.800 L.Under the same conditions,what number of moles occupies 1.200 L?

Correct AnswerverifiedShow Answer

Identify the element or molecule that has the lowest effusion rate.

Correct AnswerverifiedShow Answer

To what volume will a 2.33 L sample of gas expand if it is heated from 30.0°C to 300.0°C?

Correct AnswerverifiedA

The volume of a gas is inversely proportional to the pressure of a gas is known as

Correct AnswerverifiedShow Answer

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Determine the density of N₂ gas at STP.

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How many molecules of N₂ are contained in a 10.0 L tank at 7.53 atm and 485 K?

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The rate of effusion depends on the spee...
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When 15.0 g of zinc metal reacts with excess HCl,how many liters of H₂ gas are produced at STP?

Correct Answer
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The action of some commercial drain cleaners is based on the following reaction: 2 NaOH(s) + 2 Al(s) + 6 H₂O(l) → 2 NaAl(OH) ₄(s) + 3 H₂(g) What is the volume of H₂ gas formed at STP when 4.32 g of Al reacts with excess NaOH?

Correct Answer
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C

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The mole fraction of argon in dry air near sea level is 1.819 × 10^-5 where the molar mass of argon is 39.948.The concentration of argon in the atmosphere is ________%.

Correct Answer
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D

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How many grams of NOgas are there in a 5.00-L cylinder at 4.00 × 10³ mm Hg and 23°C?

Correct Answer
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A

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