Deck 5: The Gaseous State

Question 1

A particular gas exerts a pressure of 4.33 bar.What is this pressure in units of atmospheres?

A)4.38 atm
B)3.25 × 10³ atm
C)3.33 × 10³ atm
D)4.27 atm
E)4.33 atm

Answer 1

4.27 atm

Question 2

A flexible vessel contains 43 L of gas where the pressure is 1.3 atm.What will the volume be when the pressure is 0.61 atm,the temperature remaining constant?

A)0.011 L
B)20 L
C)43 L
D)0.044 L
E)92 L

Answer 2

92 L

Question 3

A particular gas exerts a pressure of 2.52 bar.What is this pressure in units of pascals?

A)​2.49 × 10⁵ Pa
B)​2.52 × 10^-5 Pa
C)​2.52 × 10⁵ Pa
D)​2.55 × 10⁵ Pa
E)​2.49 × 10^-5 Pa

Answer 3

​2.52 × 10⁵ Pa

Question 4

A 2.00-L glass soda bottle filled only with air is tightly capped at 25°C and 728.0 mmHg.If the bottle is placed in water at 65°C,what is the pressure in the bottle?

A)280 mmHg
B)826 mmHg
C)1890 mmHg
D)642 mmHg
E)324 mmHg

Question 5

A flexible vessel contains 78.00 L of gas at a pressure of 1.50 atm.Under conditions of constant temperature and moles of gas,what is the pressure of the gas when the volume of the vessel is tripled?

A)0.572 atm
B)4.5111 atm
C)2.38 atm
D)1.5 atm
E)0.025578 atm

Question 6

Absolute zero is the point at which

A)a straight-line graph of V versus T (°C)intersects the origin.
B)a straight-line graph of 1/V versus P at constant T intersects the origin.
C)gaseous helium liquefies.
D)a straight-line graph of V versus 1/P at constant T intersects the origin.
E)a straight-line graph of V versus T (K)intersects the origin.

Question 7

A particular gas exerts a pressure of 4.09 × 10⁴ Pa.What is this pressure in units of atmospheres?​

A)​0.403 atm
B)​4.04 × 10⁹ atm
C)​0.414 atm
D)0.409 ​atm
E)4.14​ × 10⁹ atm

Question 8

A flexible vessel is filled to a certain pressure with 28.00 L of gas.Under conditions of constant temperature and moles of gas,how does the pressure of the gas change when the volume of the gas is tripled?

A)The pressure decreases by a factor of three.
B)The pressure increases by a factor of two.
C)The pressure remains the same.
D)The pressure decreases by a factor of two.
E)The pressure decreases by a factor of four.

Question 9

The pressure of a certain gas is measured to be 264.6 mmHg.What is this pressure expressed in units of pascals?​

A)​3.436 × 10^-6 Pa
B)​2.91 × 10⁵ Pa
C)​2.835 × 10^-5 Pa
D)​2.681 × 10⁷ Pa
E)​3.528 × 10⁴ Pa

Question 10

It is possible to make a barometer using a liquid other than mercury.What would be the height (in meters)of a column of dichloromethane at a pressure of 0.830 atm,given that 0.830 atm is equal to a 0.63522 m column of mercury and the densities of mercury and dichloromethane are 13.5 g/cm³ and 1.33 g/cm³,respectively.

A)6.4641 m
B)0.156 m
C)0.0621 m
D)0.838 m
E)1.19 m

Question 11

A particular gas exerts a pressure of 689 mmHg.What is this pressure in units of bar?

A)5.17 × 10⁵ bar
B)5.31 × 10⁵ bar
C)698 bar
D)0.894 bar
E)0.918 bar

Question 12

A particular gas exerts a pressure of 4.02 atm.What is this pressure in units of bar?

A)3.06 × 10³ bar
B)4.02 × 10⁵ bar
C)4.07 bar
D)3.96 bar
E)5.29 × 10^-3 bar

Question 13

A particular gas exerts a pressure of 731 mmHg.What is this pressure in units of atmospheres?

A)5.48 × 10⁵ atm
B)5.63 × 10⁵ atm
C)721 atm
D)0.974 atm
E)0.961 atm

Question 14

The following volume-temperature plots were made at different values of constant pressure while the number of moles of gas in each experiment remained the same.Which plot represents measurements at the highest pressure?

A)B
B)C
C)A
D)They are all at the same pressure.
E)D

Question 15

A sample of methane,CH₄,occupies a volume of 318.0 mL at 25°C and exerts a pressure of 1010.0 mmHg.If the volume of the gas is allowed to expand to 770.0 mL at 298 K,what will be the pressure of the gas?

A)2440 mmHg
B)4970 mmHg
C)417.1 mmHg
D)0.01727 mmHg
E)452 mmHg

Question 16

The pressure of a certain gas is measured to be 4.304 × 10³ Pa.What is this pressure expressed in units of mmHg?​

A)​5.589 × 10^-5 mmHg
B)​3.271 × 10⁶ mmHg
C)​3.098 × 10^-2 mmHg
D)​32.28 mmHg
E)​1.789 × 10⁴ mmHg

Question 17

A particular gas exerts a pressure of 5.56 × 10⁴ Pa.What is this pressure in units of bar?

A)​5.56 × 10⁹ bar
B)​0.556 bar
C)​73.1 bar
D)​5.49 ×10⁴ bar
E)​5.63 × 10⁴ bar

Question 18

A particular gas exerts a pressure of 2.42 atm.What is this pressure in units of mmHg?

A)2.38 mmHg
B)1.84 × 10³ mmHg
C)2.45 mmHg
D)3.18 × 10^-3 mmHg
E)1.86 × 10³ mmHg

Question 19

When the valve between the 2.00-L bulb,in which the gas pressure is 2.50 atm,and the 3.00-L bulb,in which the gas pressure is 1.50 atm,is opened,what will be the final pressure in the two bulbs? Assume the temperature remains constant.

A)1.90 atm
B)4.00 atm
C)2.17 atm
D)2.10 atm
E)1.83 atm

Question 20

A flexible vessel contains 37 L of gas where the pressure is 1.0 atm.What will the volume be when the pressure is 0.70 atm,the temperature remaining constant?

A)0.019 L
B)26 L
C)37 L
D)0.046 L
E)53 L

Question 21

A flexible container is charged with a certain volume of gas at 315.0 Κ.Under conditions of constant pressure and moles of gas,how does the temperature of the gas change when the volume is tripled?

A)The temperature increases by a factor of three.
B)The temperature decreases by a factor of four.
C)The temperature decreases by a factor of two.
D)The temperature increases by a factor of four.
E)The temperature increases by a factor of two.

Question 22

What volume of sulfur trioxide gas,SO₃,has the same number of atoms as 4 L of helium gas at the same temperature and pressure?

A)20 L
B)0.8 L
C)4 L
D)1 L
E)16 L

Question 23

What volume of gaseous oxygen,O₂,has the same moles of gas as 3 L of argon gas at the same temperature and pressure?

A)9 L
B)1 L
C)3 L
D)1.5 L
E)6 L

Question 24

A given mass of gas occupies a volume of 4.00 L at 60°C and 550 mmHg.Which of the following mathematical expressions will yield its temperature at 2.50 L and 900 mmHg?

A)​
B)​
C)
D)
E)

Question 25

A gas occupies a volume of 2.00 L at 780 mmHg and 70.0°C.Which of the following mathematical expressions will yield its volume at STP?

A)
B)
C)
D)
E)

Question 26

A gas occupies a volume of 2.75 L at 350 mmHg and 200°C.Which mathematical expression gives the correct volume at 600 mmHg and 250°C?

A)
B)
C)
D)
E)​

Question 27

Which of the following is a correct statement of Charles's law, ?

A)The volume of a gas varies proportionally with the pressure.
B)The volume of a gas sample varies directly with the absolute temperature.
C)All gas samples of the same volume at STP contain the same number of atoms.
D)The pressure of a gas sample varies inversely with the volume.
E)All gas samples of the same volume at STP contain the same number of molecules.

Question 28

A flexible container is charged with 79.00 L of gas at 352 Κ.Under conditions of constant pressure and moles of gas,what is the volume of the gas when the temperature is decreased by a factor of three?

A)26.3 L
B)237 L
C)0.00421 L
D)79 L
E)11.8 L

Question 29

A fixed amount of gas in a rigid container is heated from 300 to 600 K.Which of the following responses best describes what will happen to the pressure of the gas?

A)The pressure will increase by a factor of 2.
B)The pressure will increase by a factor less than 2.
C)The pressure will increase by a factor greater than 2.
D)The pressure will decrease by a factor of 2.
E)The pressure will remain the same.

Question 30

A 1.00-L bulb contains a sample of O₂ at 25°C and 1.00 atm pressure.A second 1.00-L bulb contains a sample of CH₄ at 25°C and 1.00 atm pressure.What is the ratio of the number of molecules of methane to the number of molecules of oxygen in each of the containers?

A)2:5
B)
C)5:2
D)
E)1:1

Question 31

A fixed amount of gas in a rigid container is heated from 100°C to 600°C.Which of the following responses best describes what will happen to the pressure of the gas?

A)The pressure will increase by a factor greater than 6.
B)The pressure will increase by a factor of 6.
C)The pressure will increase by a factor less than 6.
D)The pressure will decrease by a factor of 6.
E)The pressure will remain the same.

Question 32

The pressure of 6.2 L of nitrogen gas in a flexible container is decreased to one-half its original pressure,and its absolute temperature is increased to double the original temperature.The volume is now

A)3.1 L.
B)6.2 L.
C)12 L.
D)25 L.
E)1.6 L.

Question 33

A rigid container is charged with a gas to a pressure of 740 mmHg at 40.0°C and tightly sealed.If the temperature of the gas increases by 80.0°C what is the new pressure?

A)1480 mmHg
B)589 mmHg
C)551 mmHg
D)929 mmHg
E)1110 mmHg

Question 34

A gas occupying a volume of 1.50 L exerts a pressure of 700 mmHg at 200°C.Which mathematical expression gives the correct pressure at 3.50 L and 350°C?

A)
B)
C)
D)
E)

Question 35

Which of the following statements,concerning equal volumes of the gases dinitrogen monoxide,N₂O,and propane,C₃H₈,at the same temperature and pressure,is not correct?

A)The moles of N₂O and C₃H₈ are equal.
B)They have the same density.
C)They have the same number of molecules.
D)They have the same number of atoms.
E)They have the same absolute temperature.

Question 36

Which conditions of P,T,and n,respectively,are most ideal?

A)low P,low T,low n
B)high P,low T,high n
C)low P,high T,high n
D)low P,high T,low n
E)high P,high T,high n

Question 37

A 23.6 -L sample of nitrogen at 4.45 atm and 23°C is simultaneously expanded to 50.8 L and heated to 37°C.What is the new pressure of the gas?

A)3.33 atm
B)2.17 atm
C)167 atm
D)257 atm
E)1.97 atm

Question 38

The behavior of PH₃(g)is most likely to approach ideal behavior at

A)1.0 atm and 100°C.
B)0.10 atm and -100°C.
C)10 atm and 100°C.
D)0.10 atm and 100°C.
E)1.0 atm and 0°C.

Question 39

The volume of a sample of gas measured at 35.0°C and 1.00 atm pressure is 2.00 L.What must the final temperature be in order for the gas to have a final volume of 3.00 L at 1.00 atm pressure?

A)189.0°C
B)52.5°C
C)-220.5°C
D)23.3°C
E)-67.7°C

Question 40

Equal volumes of propane,C₃H₈,and carbon monoxide,CO,at the same temperature and pressure have the same

A)chemical properties.
B)number of atoms.
C)average molecular speed.
D)density.
E)number of molecules.

Question 41

A 3.74-L cylinder contains 4.17 g of methane,CH₄,at a pressure of 3020 mmHg.What is the temperature of the gas?

A)696°C
B)423°C
C)969°C
D)2900°C
E)129°C

Question 42

Which of the following statements is incorrect regarding a 128-g sample of gaseous sulfur dioxide at 0°C and 760 mmHg pressure?

A)The density of the gas is 2.86 g/L.
B)There are 2 × 6.02 × 10²³ atoms of oxygen present.
C)There are 2 mol of gas present.
D)The molar mass of the gas is 64 g/mol.
E)The volume of the gas is 44.8 L.

Question 43

Which of the following graphs does not correctly describe the ideal gas law?

A)
B)They all correctly represent the ideal gas law.
C)
D)
E)

Question 44

The density of ethane,C₂H₆ (30.1 g/mol),at 25°C and 1.13 atm pressure is

A)1.39 g/L.
B)16.6 g/L.
C)1.34 g/L.
D)0.719 g/L.
E)0.136 g/L.

Question 45

Which of the following gases has the greatest density at 2.5 atm and 25°C?

A)C₄H₈
B)SO₂
C)N₂O
D)O₂
E)NF₃

Question 46

A 22.4 L high pressure reaction vessel is charged with 0.5020 mol of iron powder and 1.39 atm of oxygen gas at standard temperature.On heating,the iron and oxygen react according to the balanced reaction below.
4Fe(s)+ 3O₂(g)→ 2Fe₂O₃(s)
After the reaction vessel is cooled,and assuming the reaction goes to completion,what pressure of oxygen remains?

A)1 atm
B)1.385 atm
C)0.715 atm
D)0.376 atm
E)0.251 atm

Question 47

The density of O₂ gas at 16°C and 1.27 atm is

A)31 g/L.
B)28.4 g/L.
C)1.71 g/L.
D)88.7 g/mL.
E)0.584 g/L.

Question 48

At 25°C and 449 mmHg,an unknown pure gas has a density of 0.676 g/L.Which of the following gases could be the unknown gas?

A)Cl₂
B)C₃H₆
C)Cl₂O
D)Ne
E)N₂

Question 49

The number of molecules in 1.0 L of air at 0°C and 1.0 atm pressure is

A)between 10²⁰ and 10²¹.
B)between 10²³ and 6 × 10²³.
C)between 10²² and 10²³.
D)less than 10²⁰.
E)between 10²¹ and 10²².

Question 50

How many moles of gas are in a gas sample occupying 0.816 L at 127 mmHg and 22°C?

A)178 mol
B)4.28 mol
C)57.4 mol
D)0.00563 mol
E)0.000462 mol

Question 51

The density of a gas is 0.803 g/L at STP.What is its molar mass?

A)5.0 g/mol
B)24.1 g/mol
C)27.9 g/mol
D)22.4 g/mol
E)18.0 g/mol

Question 52

An unknown gaseous hydrocarbon consists of 85.63% carbon by mass.A 0.959-g sample of the gas occupies a volume of 0.51 L at STP.What is the identity of the gas?

A)C₃H₆
B)C₄H₈
C)C₅H₁₀
D)CH₂
E)C₂H₄

Question 53

What is the pressure of a 34.8-L gas sample containing 7.45 mol of gas at 19.9°C? (R = 0.0821 L • atm/(K • mol),1 atm = 760 torr)

A)2.66 × 10² mmHg
B)6.77× 10^-3 mmHg
C)5.14 mmHg
D)3.91 × 10³ mmHg
E)1.48 × 10² mmHg

Question 54

For an ideal gas,which of the following statements is true?

A)P is inversely proportional to n at constant V and T.
B)V is inversely proportional to T at constant n and P.
C)V is inversely proportional to n at constant P and T.
D)n is inversely proportional to T at constant P and V.
E)P is inversely proportional to T at constant n and V.

Question 55

A mixture consisting of 0.140 mol N₂,0.037 mol O₂,0.104 mol CH₄,and an unknown amount of CO₂ occupies a volume of 8.48 L at 27°C and 1.06 atm pressure.How many moles of CO₂ are there in this sample?

A)0.719 mol
B)0.0839 mol
C)2.45 mol
D)3.77 mol
E)0.364 mol

Question 56

The volume of 1 mol of nitrogen

A)is lower than that of 1mol ammonia at high pressures.
B)is decreased by decreasing the pressure of the gas.
C)has the value of 22.4 L at 0°C and 1.00 atm.
D)is decreased by increasing its kinetic energy.
E)is increased by decreasing the temperature.

Question 57

How many moles of gas are in a gas sample occupying 1.40 L at 553 mmHg and 294 K?

A)32.1 mol
B)0.0422 mol
C)23.7 mol
D)0.00346 mol
E)2.63 mol

Question 58

The following gases are stored in identical flexible containers at 25°C and 1.00 atm pressure.Order the gases from highest to lowest density.
1)200 g propane,C₃H₈
2)100 g carbon dioxide,CO₂
3)50 g nitrous oxide,N₂O

A)1 ≈ 2 ≈ 3
B)3 > 2 > 1
C)1 > 2 > 3
D)2 > 1> 3
E)1 > 2 ≈ 3

Question 59

An excess of sodium hydroxide is treated with 2.9 L of dry hydrogen chloride gas measured at STP.What is the mass of sodium chloride is formed?

A)1.45g
B)15.1 g
C)7.6 g
D)15 g
E)169 g

Question 60

Which of the following samples has the fewest moles of gas?

A)1.00 L of CH₄ at STP
B)1.00 L of Ar at -10.0°C and 1.00 atm
C)1.00 L of NH₃ at STP
D)1.00 L of H₂ at 0.0°C and 1.54 atm
E)1.00 L of HCl at 20°C and 1.00 atm

Question 61

The following equation represents the oxidation of ammonia,NH₃.
4NH₃(g)+ 5O₂(g)→ 4NO(g)+ 6H₂O(g)
At the same temperature and pressure,what is the maximum volume of nitrogen monoxide that can be obtained from 7.55 × 10² L of ammonia and 7.55 × 10² L of oxygen?

A)1.7 × 10³ L
B)3.36 × 10² L
C)6.04 × 10² L
D)1.51 × 10³ L
E)7.55 × 10² L

Question 62

A 28.3-g mixture of oxygen and argon is found to occupy a volume of 17.2 L when measured at 882.7 mmHg and 39.3^oC.What is the partial pressure of oxygen in this mixture?

A)369 mmHg
B)441 mmHg
C)512 mmHg
D)418 mmHg
E)464 mmHg

Question 63

In a mixture of helium and chlorine,occupying a volume of 12.8 L at 605.6 mmHg and 21.6^oC,it is found that the partial pressure of chlorine is 143 mmHg.What is the total mass of the sample?

A)31.6 g
B)0.4 g
C)8.37 g
D)1.28 g
E)7.09 g

Question 64

Which statement is inconsistent with the kinetic theory of an ideal gas?

A)Most of the volume occupied by a gas is empty space.
B)The forces of repulsion between gas molecules are very weak or negligible.
C)Gas molecules move in a straight line between collisions.
D)The average kinetic energy of a gas is proportional to the absolute temperature.
E)The collisions between gas molecules are inelastic.

Question 65

A sample of oxygen is collected over water at a total pressure of 678.4 mmHg at 25°C.The vapor pressure of water at 25°C is 23.8 mmHg.The partial pressure of the O₂ is

A)0.9239 atm.
B)0.9161 atm.
C)0.8926 atm.
D)1.092 atm.
E)0.8613 atm.

Question 66

Which of the following is included as a postulate in the kinetic molecular theory of an ideal gas?

A)Collisions between molecules are all elastic.
B)All molecules move randomly in zigzag directions.
C)The distance between gas molecules is small compared with the size of the molecule.
D)All the molecules have the same velocity.
E)In an average collision between molecules,both molecules have the same kinetic energy.

Question 67

What volume of ammonia gas,measured at 547.9 mmHg and 27.6^oC,is required to produce 8.98 g of ammonium sulfate according to the following balanced chemical equation?
2NH₃(g)+ H₂SO₄(aq)→ (NH₄)₂SO₄(s)

A)0.000992 L
B)0.00397 L
C)1.16 L
D)18 L
E)4.65 L

Question 68

A 15.6-g mixture of nitrogen and carbon dioxide is found to occupy a volume of 9.9 L when measured at 940.2 mmHg and 54.9°C.What is the mole fraction of carbon dioxide in this mixture?

A)0.486
B)0.5
C)0.513
D)0.597
E)0.402

Question 69

A small amount wet of hydrogen gas (H₂)can be prepared by the reaction of zinc with excess hydrochloric acid and trapping the gas produced in an inverted tube initially filled with water.If the total pressure of the gas in the collection tube is 757.9 mmHg at 25°C,what is the partial pressure of the hydrogen? The vapor pressure of water is 23.8 mmHg.

A)734.1 mmHg
B)781.7 mmHg
C)757.9 mmHg
D)32.8 mmHg
E)47.7 mmHg

Question 70

A vessel with a volume of 12.4 L contains 2.80 g of nitrogen gas,0.403 g of hydrogen gas,and 79.9 g of argon gas.At 25°C,what is the pressure in the vessel?

A)164 atm
B)256.2 atm
C)4.54 atm
D)0.380 atm
E)2.27 atm

Question 71

The following equation represents the partial combustion of methane,CH₄.
2CH₄(g)+ 3O₂(g)→ 2CO(g)+ 4H₂O(g)
At constant temperature and pressure,what is the maximum volume of carbon monoxide that can be obtained from 6.62 × 10² L of methane and 3.31 × 10² L of oxygen?

A)9.93 × 10² L
B)6.62 × 10² L
C)2.32 × 10³ L
D)2.21 × 10² L
E)1.32 × 10³ L

Question 72

A high temperature reaction vessel is charged with 0.5080 mol of iron powder and 42.1 L of oxygen gas at standard temperature at pressure.On heating,the iron and oxygen react according to the balanced reaction below.
4Fe(s)+ 3O₂(g)→ 2Fe₂O₃(s)
After the reaction vessel is cooled,and assuming the reaction goes to completion,what volume of oxygen remains?

A)33.5 L
B)42.1 L
C)26.9 L
D)8.53 L
E)0.254 L

Question 73

A sample of hydrogen was collected by water displacement at 23.0°C and an atmospheric pressure of 735 mmHg.Its volume is 568 mL.After water vapor is removed,what volume would the hydrogen occupy at the same conditions of pressure and temperature? (The vapor pressure of water at 23.0°C is 21 mmHg.)

A)509 mL
B)539 mL
C)552 mL
D)568 mL
E)585 mL

Question 74

What is the volume occupied by a mixture of 0.774 mol of N₂ and 0.774 mol of O₂ gases at 1.04 atm and 25.6°C?

A)1.1 × 10³ L
B)36.5 L
C)1.56 L
D)3.12 L
E)18.2 L

Question 75

In which of the following reactions will the pressure increase upon completion of the reaction at constant temperature?

A)C(s)+ O₂(g)→ CO₂(g)
B)2NO(g)+ O₂(g)→ 2NO₂(g)
C)C₂H₆O(l)+ 3O₂(g)→ 2CO₂(g)+ 3H₂O(l)
D)4NH₃(g)+ 5O₂(g)→ 4NO(g)+ 6H₂O(g)
E)Cl₂(g)+ 3F₂(g)→ 2ClF₃(g)

Question 76

Calcium nitrate will react with ammonium chloride at slightly elevated temperatures,as represented in the equation below.
Ca(NO₃)₂(s)+ 2NH₄Cl(s)→ 2N₂O(g)+ CaCl₂(s)+ 4H₂O(g)
What is the maximum volume of N₂O at STP that could be produced using a 5.20-mol sample of each reactant?

A)1.42 × 10³ L
B)233 L
C)8.58 × 10^-3 L
D)116 L
E)22.4 L

Question 77

The partial pressures of CH₄,N₂,and O₂ in a sample of gas were found to be 183 mmHg,443 mmHg,and 693 mmHg,respectively.What is the mole fraction of nitrogen?

A)21.7
B)0.912
C)0.525
D)0.410
E)0.336

Question 78

What is the partial pressure of carbon dioxide in a container that contains 3.63 mol of oxygen,1.49 mol of nitrogen,and 4.49 mol of carbon dioxide when the total pressure is 871 mmHg?

A)329 mmHg
B)763 mmHg
C)135 mmHg
D)406 mmHg
E)871 mmHg

Question 79

What is the total volume of gases produced at 1092 K and 1.00 atm pressure when 320 g of ammonium nitrite undergoes the following decomposition reaction?
NH₄NO₂(s)→ N₂(g)+ 2H₂O(g)

A)4 × 22.4 L
B)22.4 L
C)20 × 22.4 L
D)5 × 22.4 L
E)60 × 22.4 L

Question 80

If 636.0 mL of nitrogen gas,measured at 488.9 mmHg and 22.3^oC,reacts with excess iodine according to the following reaction,what mass of nitrogen triiodide is produced?
N₂(g)+ 3I₂(s)→ 2NI₃(s)

A)0.472 g
B)6.66 g
C)3.33 g
D)13.3 g
E)176 g