Deck 12: The Gaseous State of Matter

Question 1

A pressure of 340.mm Hg is equal to

A)2.24 torr
B)0.448 torr
C)340.torr
D)1.25 torr

Answer 1

340.torr

Question 2

A pressure of 3.00 atm is equal to

A)819 mm Hg
B)3000 mm Hg
C)2280 mm Hg
D)253 mm Hg

Answer 2

2280 mm Hg

Question 3

Which of the following gases would have the greatest kinetic energy at 300 K?

A)N₂
B)NH₃
C)Ar
D)All of them would have the same kinetic energy

Answer 3

All of them would have the same kinetic energy

Question 4

Which gas will diffuse most rapidly?

A)CO₂
B)N₂
C)He
D)Cl₂

Question 5

A pressure of 1030 torr is equal to

A)0.738 atm
B)0.265 atm
C)1.36 atm
D)3.77 atm

Question 6

A 120.mL sample of a gas is at a pressure of 1.50 atm.If the temperature remains constant, what will be its volume at 3.50 atm of pressure?

A)280.mL
B)22.9 mL
C)120.mL
D)51.4 mL

Question 7

Under which set of conditions will a real gas be most likely to act as an ideal gas?

A)High temperature and high pressure
B)High temperature and low pressure
C)Low temperature and high pressure
D)Low temperature and low pressure

Question 8

The following figure represents one mole of an ideal gas in a container fit with a movable piston. Which figure shows the change,if any,that would take place if the Kelvin temperature is doubled under constant pressure?

A)
B)
C)
D)

Question 9

As the number of molecules in a gas sample increases,temperature and volume remaining constant,the pressure exerted by the gas

A)increases.
B)decreases.
C)remains the same.

Question 10

A 4.00 L sample of a gas is at a pressure of 2.00 atm.If the temperature remains constant, what will be its volume at 0.500 atm of pressure?

A)1.00 L
B)16.0 L
C)0.250 L
D)4.00 L

Question 11

As the temperature of a gas sample increases,the number of molecules and volume remaining constant,the pressure exerted by the gas

A)increases.
B)decreases.
C)remains the same.

Question 12

A hot air balloon is filled to a volume of 44.5 L at 758 torr.What will be the volume of the balloon if the pressure decreases to 748 torr under constant temperature?

A)45.1 L
B)43.9 L
C)44.5 L
D)49.0 L

Question 13

Which gas would have the lowest velocity at 280 K?

A)Ar
B)Ne
C)H₂
D)CO

Question 14

A sample of a gas is held at constant temperature.If the number of moles of gas in the sample is doubled while the pressure is halved,what will happen to the volume of the gas sample?

A)It will increase.
B)It will decrease.
C)It will not change.

Question 15

A pressure of 3240 torr is equal to

A)0.235 mm Hg
B)11.9 mm Hg
C)4.26 mm Hg
D)3240 mm Hg

Question 16

As the pressure of a sample of gas is increased at constant temperature,the volume of the gaswill

A)increases.
B)decreases.
C)remain the same.

Question 17

The following figure shows 1 mol of an ideal gas inside a container with a movable piston. If we add two additional moles of gas under constant temperature and pressure,select the alternative that represents the change,if any,that will take place.

A)
B)
C)
D)

Question 18

Under which set of conditions will a real gas be least likely to act as an ideal gas?

A)High temperature and high pressure
B)High temperature and low pressure
C)Low temperature and high pressure
D)Low temperature and low pressure

Question 19

A 3.00 L sample of a gas at a pressure of 4.00 atm is compressed to 2.00 L at a constant temperature.What is the pressure of the gas?

A)2.00 atm
B)6.00 atm
C)12.0 atm
D)24.0 atm

Question 20

A pressure of 414 mm Hg is equal to

A)0.545 atm
B)0.659 atm
C)1.52 atm
D)1.84 atm

Question 21

At STP,3.00 L of nitrogen gas contains the same number of molecules as

A)1.00 L of nitrogen gas
B)2.00 L of oxygen gas
C)3.00 L of chlorine gas
D)4.00 L of hydrogen gas

Question 22

A sample of gas has a volume of 3.40 L at 10.0 ^°C.What will be its volume at 100.0^°C, pressure remaining constant?

A)0.340 L
B)4.48 L
C)34.0 L
D)2.58 L

Question 23

At STP,which sample contains twice the number of molecules found in 4.00 L of hydrogen gas?

A)1.00 L of He
B)2.00 L of He
C)4.00 L of He
D)8.00 L of He

Question 24

A sample of gas has a volume of 200.mL at 20.0 ^° C.What will be its volume at 40.0 ^°C, pressure remaining constant?

A)18.8 mL
B)214 mL
C)100.mL
D)400.mL

Question 25

A mixture of gases consists of helium at a partial pressure of 400.torr,neon at a partial pressure of 300.torr,and argon at a partial pressure of 200.torr.What is the total pressure of this mixture of gases?

A)300.torr
B)760.torr
C)900.torr
D)1000 torr

Question 26

A sample of gas has a volume of 8.00 L at 20.0 ^° C and 700.torr.What will be its volume atSTP?

A)1.20 L
B)9.32 L
C)53.2 L
D)6.87 L

Question 27

A sample of gas is in a cylinder of fixed volume.At 30.0 ^°C its internal pressure is 3200. torr.What will be its pressure at 12.0 ^° C?

A)8000.torr
B)1280.torr
C)3400.torr
D)3010.torr

Question 28

A sample of oxygen is collected over water at 22 ^° C and 762 torr.What is the partial pressure of the dry oxygen? The vapor pressure of water at 22^°C is 19.8 torr.

A)742 torr
B)782 torr
C)784 torr
D)750.torr

Question 29

A sample of gas has a volume of 400.mL at STP.What will be its volume at 20.0 ^° C and700.torr?

A)466 mL
B)343 mL
C)60.1 mL
D)2660 mL

Question 30

The volume of a gas must always decrease when

A)temperature increases and pressure increases.
B)temperature increases and pressure decreases.
C)temperature decreases and pressure increases.
D)temperature decreases and pressure decreases.

Question 31

A 400.mL sample of hydrogen is collected over water at 23.0 ^° C and 758.4 torr.What isthe volume of the dry hydrogen gas at 23.0 ^° C and 758.4 torr? The vapor pressure of water at 23.0 ^° C is 21.1 torr.

A)144 mL
B)389 mL
C)411 mL
D)14400 mL

Question 32

A sample of gas has a volume of 1380 mL at a temperature of 20.0 ^° C.What will be its volume at 0.00^°C,pressure remaining constant?

A)0.00 mL
B)1290 mL
C)1380 mL
D)1480 mL

Question 33

What is the volume of 0.132 moles of carbon dioxide gas at STP?

A)2.96 L
B)5.81 L
C)170.L
D)333 L

Question 34

A sample of gas is in a cylinder of fixed volume.At 20.0 ^°C its internal pressure is 3.42 atm.What will be its pressure at 120.0^°C?

A)2.55 atm
B)4.59 atm
C)0.570 atm
D)20.5 atm

Question 35

What is the volume of 3.00 moles of neon gas at STP?

A)6.73 L
B)7.47 L
C)60.6 L
D)67.2 L

Question 36

As the temperature of a sample of gas is increased at constant pressure,its volume will

A)increase.
B)decrease.
C)remain the same.

Question 37

A sample of gas is in a cylinder of fixed volume.As the temperature of the sampleincreases,its internal pressure will

A)increase.
B)decrease.
C)remain the same.

Question 38

A sample of gas is in a cylinder of fixed volume.At 20.0 ^° C its pressure is 4.00 atm.At what temperature will its pressure be 8.00 atm?

A)10.0 ^° C
B)40.0 ^° C
C)-127^°C
D)313 ^° C

Question 39

The volume of a gas must always increase when

A)temperature increases and pressure increases.
B)temperature increases and pressure decreases.
C)temperature decreases and pressure increases.
D)temperature decreases and pressure decreases.

Question 40

A sample of gas has a volume of 850.mL at 23.0 ^° C and 1.10 atm.The temperature is increased to 33.0 ^° C,at what pressure will its volume be 900.mL?

A)1.20 atm
B)1.49 atm
C)1.07 atm
D)0.812 atm

Question 41

How many moles are present in 10.0 L of nitrogen gas at STP?

A)2.24 moles
B)2.80 moles
C)0.446 moles
D)224 moles

Question 42

How many moles are present in 300.L of ammonia gas at STP?

A)0.0568 moles
B)13.4 moles
C)0.0747 moles
D)17.6 moles

Question 43

What is the molar mass of a gas if 18.0 L of the gas at STP has a mass of 41.6 grams?

A)51.8 g
B)9.69 g
C)33.4 g
D)1.86 g

Question 44

What is the molar mass of a gas if 30.0 L of the gas at STP has a mass of 16.0 grams?

A)2.05 g
B)11.9 g
C)21.4 g
D)42.0 g

Question 45

What is the molar mass of a gas if 40.0 L of the gas has a mass of 36.0 g at 740.torr and 30.0 ^° C?

A)333 g
B)33.1 g
C)23.0 g
D)56.0 g

Question 46

What is the volume of 1.40 moles of chlorine gas at STP?

A)31.4 L
B)16.0 L
C)0.316 L
D)3.17 L

Question 47

What is the molar mass of a gas if 12.0 L of the gas at STP has a mass of 16.0 grams?

A)8.57 g
B)22.4 g
C)16.8 g
D)29.9 g

Question 48

What is the density of nitrogen gas at STP?

A)0.625 g/L
B)0.799 g/L
C)1.60 g/L
D)1.25 g/L

Question 49

At what temperature would 0.600 mole of a gas at 700.torr have a volume of 22.6 L?

A)150. ^° C
B)225 ^° C
C)423 ^° C
D)498 ^° C

Question 50

What is the molar mass of a gas if 26.0 L of the gas has a mass of 43.6 g at 1.10 atm and 10.0 ^° C?

A)35.4 g
B)0.799 g
C)17.9 g
D)0.0282 g

Question 51

What volume of carbon dioxide gas is produced when 3.00 L of oxygen gas react with 7.5 L of carbon monoxide in the following equation?
2 CO(g)+ O₂(g) $\rarr$ 2 CO₂(g)

A)6.00 L
B)10.5 L
C)6.75 L
D)3.00 L

Question 52

What is the volume of 1.40 moles of nitrogen gas at 20.0 ^° C and 770.torr?

A)33.2 L
B)2.27 L
C)0.0437 L
D)405 L

Question 53

How many moles are present in 30.0 L of helium gas at STP?

A)0.179 moles
B)0.747 moles
C)1.34 moles
D)7.47 moles

Question 54

What is the molar mass of a gas if 16.0 L of the gas has a mass of 19.0 g at 765 torr and 20.0 ^°C?

A)0.0352 g
B)28.4 g
C)26.8 g
D)1.94 g

Question 55

What volume of oxygen is consumed when 3.00 moles of carbon monoxide is produced in the following equation? 2 C(s)+ O₂(g) $\rarr$ 2 CO(g)

A)1.50 L
B)33.6 L
C)67.2 L
D)22.4 L

Question 56

At which pressure would a 2.60 mole sample of gas at 20.0 ^° C have a volume of 25.0 L?

A)0.171 atm
B)15.8 atm
C)2.08 atm
D)2.50 atm

Question 57

What is the density of carbon dioxide gas at STP?

A)1.96 g/L
B)0.509 g/L
C)2.40 g/L
D)1.00 g/L

Question 58

Which of the following is not an assumption under KMT?

A)Gas particles have no attraction for one another.
B)During a collision,energy is lost by the gas particles and later is regained.
C)Gases at the same temperature have the same average kinetic energy.
D)Gas particles move in straight lines in all directions.

Question 59

What volume of ammonia is produced when 0.500 mole of nitrogen reacts completely in the following equation?
N₂(g)+ 3 H₂(g) $\rarr$ 2NH₃(g)

A)1.00 L
B)22.4 L
C)44.8 L
D)11.2 L

Question 60

How many grams of oxygen are consumed when 18.0 L of CH₄ gas react completely in the following equation? CH₄(g)+ 2 O₂(g) $\rarr$ CO₂(g)+ 2 H₂O(g)

A)51.4 grams
B)79.7 grams
C)576 grams
D)1.15 10³ grams

Question 61

A 64.0 g sample of oxygen contains the same number of molecules as

A)44.8 L of nitrogen
B)14.01 g of nitrogen
C)24.8 L of nitrogen
D)28.02 g of nitrogen

Question 62

Look at the apparatus shown below.Inside each chamber there is a sample of a gas at the specified volume and pressure.Once the stopcock is opened,what will be the total pressure inside the system.The whole process is done under constant temperature.

A)890 torr
B)445 torr
C)190 torr
D)223 torr

Question 63

Which gas is most dense at STP?

A)Helium
B)Nitrogen
C)Oxygen
D)Hydrogen

Question 64

What is the volume occupied by 25.0 g of oxygen gas at a pressure of 733 mm Hg and a temperature of 30.5°C?

A)20.2 L
B)2.03 L
C)26.5 L
D)6.46 L

Question 65

Calculate the density of argon gas at STP.

A)2.24 g/L
B)1.36 g/L
C)1.78 g/L
D)1.63 g/L

Question 66

An 11.2 L sample of nitrogen contains the same number of molecules as

A)8.00 g of oxygen
B)16.0 g of oxygen
C)22.4 L of oxygen
D)5.60 L of oxygen

Question 67

Which gas has approximately the same density as carbon dioxide gas at STP?

A)CH₄
B)C₂H₆
C)C₃H₈
D)C₄H₁₀

Question 68

A mixture containing 5.00 g of H₂(g)and 10.0 g of O₂(g)is allowed to react in a 15.0 L rigid container at a constant temperature of 25.0°C. 2H₂(g)+ O₂(g) 2H₂O(l)
Once the reaction is complete,what will be the pressure of the excess gas inside the container?

A)1.51 atm
B)4.04 atm
C)3.53 atm
D)3.02 atm

Question 69

How many moles of hydrogen are consumed when 40.0 L of hydrogen chloride gas are produced in the following equation?
H₂(g)+ Cl₂(g) $\rarr$ 2 HCl(g)

A)0.446 moles
B)0.893 moles
C)1.79 moles
D)3.57 moles

Question 70

A mixture of 10.0 g of Ne and 10.0 g of Ar was kept in a 1.00 L container at 765 torr.Calculate the partial pressure of Ar inside the container.

A)508 torr
B)257 torr
C)614 torr
D)125 torr

Question 71

When the following reaction took place at 23.8 °C and a pressure of 758 torr,3.90 L of O₂(g)were collected.What mass of KClO₃ decomposed? 2KClO₃(s) 2KCl(s)+ 3O₂(g)

A)163 g
B)19.6 g
C)13.0 g
D)39.1 g

Question 72

What mass of water is produced when 10.0 L of oxygen react completely in the following equation? 2 H₂(g)+ O₂(g) $\rarr$ 2 H₂O(l)

A)4.02 g
B)16.1 g
C)20.1 g
D)80.7 g

Question 73

A gas mixture containing N₂ and O₂ was kept inside a 2.00 L container at a temperature of 23.0°C and a total pressure of 1.00 atm.The partial pressure of oxygen was 0.722 atm.How many grams of nitrogen were present in the gas mixture?

A)2.31 g
B)0.577 g
C)0.641 g
D)1.90 g

Question 74

What mass of water is produced when 10.0 L of oxygen react completely in the following equation? 2 C₂H₆(g)+ 7 O₂(g) $\rarr$ 4 CO₂(g)+ 6 H₂O(g)

A)6.90 g
B)21.0 g
C)9.39 g
D)34.6 g

Question 75

What volume of chlorine is consumed when 12.0 g of HCl is produced in the following equation? H₂(g)+ Cl₂(g) $\rarr$ 2 HCl(g)

A)3.69 L
B)163 L
C)14.7 L
D)40.8 L

Question 76

A sample of an ideal gas is kept in a rigid container while the Kelvin temperature is doubled.What will happen to the pressure of the gas?

A)The pressure will double.
B)The pressure will be halved.
C)The pressure will remain constant.
D)The pressure will increase by a factor of 1.5.

Question 77

How many moles of oxygen are consumed when 100.L of dinitrogen pentoxide are produced in the following equation?
2 N₂(g)+ 5 O₂(g) $\rarr$ 2 N₂O₅(g)

A)0.560 moles
B)1.79 moles
C)0.0896 moles
D)11.2 moles

Question 78

What mass of helium would be contained within a 1.8 L balloon at a pressure of 766 torr and a temperature of 24.5°C?

A)3.61 g
B)0.297 g
C)226 g
D)0.594 g

Question 79

What volume of dinitrogen pentoxide gas is produced when 500.mL of oxygen react completely in the following equation? 2 N₂(g)+ 5 O₂(g) $\rarr$ 2 N₂O₅(g)

A)500.mL
B)400.mL
C)1250 mL
D)200.mL

Question 80

What volume of sulfur dioxide gas will be consumed when 12.0 L of oxygen is consumed in the following equation? 2 SO₂(g)+ O₂(g) $\rarr$ 2 SO₃(g)

A)6.00 L
B)12.0 L
C)24.0 L
D)60.0 L