Question 1

Determine the density of CO2 gas at STP.

Accepted Answer

A)  1.94 g L-1
B)  1.80 g L-1
C)  2.24 g L-1
D)  4.46 g L-1
E)  5.10 g L-1F) B) and C)
G) A) and E)

Question 2

What is the volume of 9.783 × 1023 atoms of He at 9.25 bar and 512 K?

Accepted Answer

A)  7.48 L
B)  3.69 L
C)  1.85 L
D)  15.4 L
E)  30.8 LF) A) and C)
G) D) and E)

Question 3

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

Accepted Answer

A)  729 m s-1
B)  515 m s-1
C)  149 m s-1
D)  297 m s-1E) B) and C)
F) C) and D)

Question 4

The volume of a gas is proportional to number of moles of a gas. What is this known as?

Accepted Answer

A)  Avogadro's law
B)  Ideal gas law
C)  Charles's law
D)  Boyle's law
E)  Dalton's lawF) A) and B)
G) C) and D)

Question 5

How many moles of CO are contained in a 5.00 L tank at 155 °C and 2.80 bar?

Accepted Answer

A)  0.393 moles
B)  1.10 moles
C)  2.51 moles
D)  0.455 moles
E)  0.289 molesF) B) and D)
G) A) and D)

Question 6

The mole fraction of nitrous oxide in dry air near sea level is 1.818 × 10-5, where the molar mass of nitrous oxide is 44.013. The concentration of nitrous oxide in the atmosphere is ________ ppm.

Accepted Answer

A)  2.0 × 1012
B)  5.0 × 10-5
C)  500
D)  18.18
E)  5.0 × 10-13F) B) and D)
G) C) and D)

Question 7

If 0.3781 g of a gas with a molecular weight of 18.015 g mol-1 is in a ridged 5.00 L container at 384 K, calculate the final pressure. Assume ideal behaviour.

Accepted Answer

A)  0.682 bar
B)  0.109 bar
C)  0.0867 bar
D)  0.134 bar
E)  0.0963 barF) B) and C)
G) B) and D)

Question 8

Identify the gas particle that travels the fastest.

Accepted Answer

A)  H2
B)  O2
C)  Ne
D)  N2
E)  COF) A) and B)
G) B) and E)

Question 9

Which of the following gases has the lowest average speed at 25 °C?

Accepted Answer

A)  C3H8
B)  Kr   
C)  CH3NH2
D)  SO2E) B) and D)
F) None of the above

Question 10

The atmospheric pressure is 715 mmHg. What is the pressure in bar?

Accepted Answer

A)  1.10 bar
B)  0.940 bar
C)  1.08 bar
D)  0.9533 bar
E)  0.9197 barF) B) and E)
G) All of the above

Question 11

Which of the following samples has the greatest density at STP?

Accepted Answer

A)  NO2
B)  Xe
C)  SO2
D)  SF6
E)  All of these samples have the same density at STP.F) B) and C)
G) A) and B)

Question 12

At what temperature does argon have a root mean square velocity of 492 m s-1?

Accepted Answer

A)  321 K
B)  291 K
C)  340 K
D)  388 K
E)  409 KF) A) and E)
G) C) and D)

Question 13

Which of the gases in the graph below has the largest molar mass?

Accepted Answer

A)  A
B)  B
C)  C
D)  D
E)  There is not enough information to determine the answer.F) C) and E)
G) B) and E)

Question 14

This equation is used to calculate the properties of a gas under nonideal conditions.

Accepted Answer

A)  Charles's law
B)  Avogadro's law
C)  Boyle's law
D)  van der Waals equation
E)  Dalton's lawF) All of the above
G) B) and E)

Question 15

Define effusion.

Accepted Answer

Effusion is the proc...

Question 16

What is the average speed (actually the root mean square speed) of a neon atom at 27 °C?

Accepted Answer

A)  5.78 m s-1
B)  19.3 m s-1
C)  183 m s-1
D)  609 m s-1E) A) and B)
F) B) and D)

Question 17

Match the following.

-Dalton's law

Accepted Answer

A)  measures blood pressure
B)  measures pressure of a gas
C)  V1/n1 = V2/n2
D)  PV = nRT
E)  P1V1 = P2V2F) measures atmospheric pressureG) V1/T1 = V2/T2H) PT = PA + PB + PC ...I) A) and E)
J) E) and F)

Question 18

The action of some commercial drain cleaners is based on the following reaction: 2NaOH(s) + 2Al(s) + 6H2O(l) → 2NaAl(OH) 4(s) + 3H2(g) 
What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?

Accepted Answer

A)  3.50 L
B)  5.25L
C)  7.98 L
D)  8.59LE) B) and D)
F) All of the above

Question 19

Which of the following gases has the highest root mean square velocity at constant temperature? NH3 CO2 NO2 F2 O3

Accepted Answer

A)  NH3
B)  CO2
C)  NO2
D)  F2
E)  O3F) D) and E)
G) A) and D)

Question 20

The ratio of the rate of effusion of oxygen to an unknown gas is 0.935. What is the other gas?

Accepted Answer

A)  Ne
B)  Ar
C)  F2
D)  N2E) A) and B)
F) A) and C)

Exam 5: Gases

Identify the gas particle that travels the fastest.

Correct AnswerverifiedShow Answer

If 0.3781 g of a gas with a molecular weight of 18.015 g mol-1 is in a ridged 5.00 L container at 384 K, calculate the final pressure. Assume ideal behaviour.

Correct AnswerverifiedShow Answer

How many moles of CO are contained in a 5.00 L tank at 155 °C and 2.80 bar?

Correct AnswerverifiedShow Answer

Define effusion.

Correct AnswerverifiedEffusion is the proc...View AnswerShow Answer

The atmospheric pressure is 715 mmHg. What is the pressure in bar?

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What is the average speed (actually the root mean square speed) of a neon atom at 27 °C?

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The mole fraction of nitrous oxide in dry air near sea level is 1.818 × 10-5, where the molar mass of nitrous oxide is 44.013. The concentration of nitrous oxide in the atmosphere is ________ ppm.

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Which of the gases in the graph below has the largest molar mass?

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Determine the density of CO2 gas at STP.

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Which of the following samples has the greatest density at STP?

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The volume of a gas is proportional to number of moles of a gas. What is this known as?

Correct AnswerverifiedShow Answer

This equation is used to calculate the properties of a gas under nonideal conditions.

Correct AnswerverifiedShow Answer

Match the following. -Dalton's law

Correct AnswerverifiedShow Answer

The ratio of the rate of effusion of oxygen to an unknown gas is 0.935. What is the other gas?

Correct AnswerverifiedShow Answer

What is the volume of 9.783 × 1023 atoms of He at 9.25 bar and 512 K?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The action of some commercial drain cleaners is based on the following reaction: 2NaOH(s) + 2Al(s) + 6H2O(l) → 2NaAl(OH) 4(s) + 3H2(g) What is the volume of H2 gas formed at STP when 6.32 g of Al reacts with excess NaOH?

Correct AnswerverifiedShow Answer

Which of the following gases has the highest root mean square velocity at constant temperature? NH3 CO2 NO2 F2 O3

Correct AnswerverifiedShow Answer

At what temperature does argon have a root mean square velocity of 492 m s-1?

Correct AnswerverifiedShow Answer

Which of the following gases has the lowest average speed at 25 °C?

Correct AnswerverifiedShow Answer

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If 0.3781 g of a gas with a molecular weight of 18.015 g mol^-1 is in a ridged 5.00 L container at 384 K, calculate the final pressure. Assume ideal behaviour.

Correct Answer
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Correct Answer
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Effusion is the proc...
View Answer

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The mole fraction of nitrous oxide in dry air near sea level is 1.818 × 10^-5, where the molar mass of nitrous oxide is 44.013. The concentration of nitrous oxide in the atmosphere is ________ ppm.

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Determine the density of CO₂ gas at STP.

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What is the volume of 9.783 × 10²³ atoms of He at 9.25 bar and 512 K?

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The action of some commercial drain cleaners is based on the following reaction: 2NaOH(s) + 2Al(s) + 6H₂O(l) → 2NaAl(OH) ₄(s) + 3H₂(g) What is the volume of H₂ gas formed at STP when 6.32 g of Al reacts with excess NaOH?

Correct Answer
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Which of the following gases has the highest root mean square velocity at constant temperature? NH₃ CO₂ NO₂ F₂ O₃

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At what temperature does argon have a root mean square velocity of 492 m s^-1?

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Correct Answer
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