Question 1

Convert 29.592 inches Hg to bar.

Accepted Answer

A)  0.9889 bar 
B)  1.011 bar 
C)  1.002 bar 
D)  1.023 bar 
E)  0.9980 bar 
A)  0.9889 bar 
B)  1.011 bar 
C)  1.002 bar 
D)  1.023 bar 
E)  0.9980 bar

Question 2

Which one of the gas laws explains why the second floor of a house is usually warmer than the ground floor?

Accepted Answer

A)  Boyle's law 
B)  Avogadro's law 
C)  Charles's law 
D)  Ideal gas law 
E)  Inert gas law 
A)  Boyle's law 
B)  Avogadro's law 
C)  Charles's law 
D)  Ideal gas law 
E)  Inert gas law

Question 3

How many molecules of XeF6 are formed from 12.9 L of F2 (at 298 K and 2.635 bar) according to the following reaction? Assume that there is excess Xe. 
Xe(g) + 3F2(g) → XeF6(g)

Accepted Answer

A)  1.21 × 1023 molecules XeF6 
B)  8.25 × 1023 molecules XeF6 
C)  2.75 × 1023 molecules XeF6 
D)  7.29 × 1023 molecules XeF6 
E)  1.37 × 1023 molecules XeF6 
A)  1.21 × 1023 molecules XeF6 
B)  8.25 × 1023 molecules XeF6 
C)  2.75 × 1023 molecules XeF6 
D)  7.29 × 1023 molecules XeF6 
E)  1.37 × 1023 molecules XeF6

Question 4

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 742 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)  656 mmHg 
B)  733 mmHg 
C)  751 mmHg 
D)  828 mmHg 
A)  656 mmHg 
B)  733 mmHg 
C)  751 mmHg 
D)  828 mmHg

Question 5

A 2.75 L container filled with CO2 gas at 25 °C and 2.25 bar springs a leak. When the container is resealed, the pressure is 1.85 bar and the temperature is 10 °C. How many moles of gas were lost?

Accepted Answer

A)  0.0 335 mol 
B)  0. 728 mol 
C)  0. 882 mol 
D)  3.39 mol 
A)  0.0 335 mol 
B)  0. 728 mol 
C)  0. 882 mol 
D)  3.39 mol

Question 6

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

Question 7

What is the volume of 5.60 g of O2 at 7.78 bar and 415 K?

Accepted Answer

A)  1.53 L 
B)  565 L 
C)  24.5 L 
D)  25.0 L 
E)  0.776 L 
A)  1.53 L 
B)  565 L 
C)  24.5 L 
D)  25.0 L 
E)  0.776 L

Question 8

A compound is found to be 30.45% N and 69.55 % O by mass. If 1.63 g of this compound occupy 389 mL at 0.00 °C and 1.0332 bar, what is the molecular formula of the compound?

Accepted Answer

A)  NO2 
B)  N2O 
C)  N4O2 
D)  N2O5 
E)  N2O4 
A)  NO2 
B)  N2O 
C)  N4O2 
D)  N2O5 
E)  N2O4

Question 9

A mixture of 10.0 g of Ne and 10.0 g Ar have a total pressure of 1.6 bar. What is the partial pressure of Ne?

Accepted Answer

A)  1.1 bar 
B)  0.80 bar 
C)  0.54 bar 
D)  0.40 bar 
E)  1.3 bar 
A)  1.1 bar 
B)  0.80 bar 
C)  0.54 bar 
D)  0.40 bar 
E)  1.3 bar

Question 10

A gas bottle contains 0. 350 mol of gas at 0.973 bar pressure. If the final pressure is 1.165 bar, how many moles of gas were added to the bottle?

Accepted Answer

A)  0.0 366 mol 
B)  0. 0691 mol 
C)  0. 387 mol 
D)  0. 419 mol 
A)  0.0 366 mol 
B)  0. 0691 mol 
C)  0. 387 mol 
D)  0. 419 mol

Question 11

If 0.240 mol of He were added to a balloon, how large would the balloon grow? Atmospheric pressure is 0.9871 bar and the ambient temperature is 23.2 °C.

Accepted Answer

A)  5.99 L 
B)  6.54 L 
C)  3.73 L 
D)  6.49 L 
E)  7.28 L 
A)  5.99 L 
B)  6.54 L 
C)  3.73 L 
D)  6.49 L 
E)  7.28 L

Question 12

What pressure (in bar) will 0.44 moles of CO2 exert in a 2.6 L container at 25 °C?

Accepted Answer

A)  0.35 bar 
B)  4.2 bar 
C)  4.7 bar 
D)  8.6 bar 
E)  3.6 bar 
A)  0.35 bar 
B)  4.2 bar 
C)  4.7 bar 
D)  8.6 bar 
E)  3.6 bar

Question 13

Determine the volume of H2S (at 375 K and 1.216 bar) needed to produce 55.0 g of S. Assume that there is excess SO2 present. 
2H2S(g) + SO2(g) → 3S(s) + 2H2O(g)

Accepted Answer

A)  44.0 L 
B)  29.3 L 
C)  22.7 L 
D)  34.1 L 
E)  66.0 L 
A)  44.0 L 
B)  29.3 L 
C)  22.7 L 
D)  34.1 L 
E)  66.0 L

Question 14

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

Accepted Answer

A)  Ne at STP 
B)  CO at 200 bar and 25 °C 
C)  SO2 at 2 bar and 0 K 
D)  N2 at 1 bar and -70 °C 
E)  O2 at 400 bar and 25 °C 
A)  Ne at STP 
B)  CO at 200 bar and 25 °C 
C)  SO2 at 2 bar and 0 K 
D)  N2 at 1 bar and -70 °C 
E)  O2 at 400 bar and 25 °C

Question 15

A mixture of 1.0 mol He and 1.0 mol Ne are at STP in a rigid container. Which of the following statements is TRUE?

Accepted Answer

A)  Both gases have the same average kinetic energy. 
B)  Both gases contribute equally to the density of the mixture under these conditions. 
C)  Both gases have the same molecular speed. 
D)  The mixture has a volume of 22.4 L. 
E)  All of the above are true. 
A)  Both gases have the same average kinetic energy. 
B)  Both gases contribute equally to the density of the mixture under these conditions. 
C)  Both gases have the same molecular speed. 
D)  The mixture has a volume of 22.4 L. 
E)  All of the above are true.

Question 16

Match the following.
-Boyle's law

Accepted Answer

A) PV = nRT 
B) V1/T1 = V2/T2 
C) V1/n1 = V2/n2 
D) PT = PA + PB + PC ... 
E) measures pressure of a gas
F)measures atmospheric pressure
G)measures blood pressure
H)P1V1 = P2V2 
A) PV = nRT 
B) V1/T1 = V2/T2 
C) V1/n1 = V2/n2 
D) PT = PA + PB + PC ... 
E) measures pressure of a gas
F)measures atmospheric pressure
G)measures blood pressure
H)P1V1 = P2V2

Question 17

How many moles of an ideal gas are required to produce a pressure of 3.00 bar in a 1.50 L container with a temperature of 25.0 °C?

Accepted Answer

A)  0.146 mol 
B)  0.0874 mol 
C)  0.182 mol 
D)  0.914 mol 
E)  1.08 mol 
A)  0.146 mol 
B)  0.0874 mol 
C)  0.182 mol 
D)  0.914 mol 
E)  1.08 mol

Question 18

Give the temperature and pressure at STP.

Accepted Answer

A)  0° C and 1.00 bar 
B)  0 K and 1.00 bar 
C)  25° C and 30.00 in Hg 
D)  300 K and 1 Torr Hg 
E)  0° C and 1 mmHg 
A)  0° C and 1.00 bar 
B)  0 K and 1.00 bar 
C)  25° C and 30.00 in Hg 
D)  300 K and 1 Torr Hg 
E)  0° C and 1 mmHg

Question 19

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

Question 20

The density of a gas is 1.41 g   at STP. What is the gas?

Accepted Answer

A)  Cl2 
B)  NH3 
C)  O2 
D)  Ne 
A)  Cl2 
B)  NH3 
C)  O2 
D)  Ne

Exam 5: Gases

Convert 29.592 inches Hg to bar.

Which one of the gas laws explains why the second floor of a house is usually warmer than the ground floor?

How many molecules of XeF6 are formed from 12.9 L of F2 (at 298 K and 2.635 bar) according to the following reaction? Assume that there is excess Xe. Xe(g) + 3F2(g) → XeF6(g)

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 742 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?

A 2.75 L container filled with CO2 gas at 25 °C and 2.25 bar springs a leak. When the container is resealed, the pressure is 1.85 bar and the temperature is 10 °C. How many moles of gas were lost?

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

What is the volume of 5.60 g of O2 at 7.78 bar and 415 K?

A compound is found to be 30.45% N and 69.55 % O by mass. If 1.63 g of this compound occupy 389 mL at 0.00 °C and 1.0332 bar, what is the molecular formula of the compound?

A mixture of 10.0 g of Ne and 10.0 g Ar have a total pressure of 1.6 bar. What is the partial pressure of Ne?

A gas bottle contains 0. 350 mol of gas at 0.973 bar pressure. If the final pressure is 1.165 bar, how many moles of gas were added to the bottle?

If 0.240 mol of He were added to a balloon, how large would the balloon grow? Atmospheric pressure is 0.9871 bar and the ambient temperature is 23.2 °C.

What pressure (in bar) will 0.44 moles of CO2 exert in a 2.6 L container at 25 °C?

Determine the volume of H2S (at 375 K and 1.216 bar) needed to produce 55.0 g of S. Assume that there is excess SO2 present. 2H2S(g) + SO2(g) → 3S(s) + 2H2O(g)

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

A mixture of 1.0 mol He and 1.0 mol Ne are at STP in a rigid container. Which of the following statements is TRUE?

Match the following. -Boyle's law

How many moles of an ideal gas are required to produce a pressure of 3.00 bar in a 1.50 L container with a temperature of 25.0 °C?

Give the temperature and pressure at STP.

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

The density of a gas is 1.41 g at STP. What is the gas?

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Filters

How many molecules of XeF₆are formed from 12.9 L of F₂ (at 298 K and 2.635 bar) according to the following reaction? Assume that there is excess Xe. Xe(g) + 3F₂(g) → XeF₆(g)

A 2.75 L container filled with CO₂ gas at 25 °C and 2.25 bar springs a leak. When the container is resealed, the pressure is 1.85 bar and the temperature is 10 °C. How many moles of gas were lost?

What is the volume of 5.60 g of O₂ at 7.78 bar and 415 K?

What pressure (in bar) will 0.44 moles of CO₂ exert in a 2.6 L container at 25 °C?

Determine the volume of H₂S (at 375 K and 1.216 bar) needed to produce 55.0 g of S. Assume that there is excess SO₂ present. 2H₂S(g) + SO₂(g) → 3S(s) + 2H₂O(g)

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