Deck 11: What If There Were No Intermolecular Forces the Ideal Gas

Question 1

The value of the gas constant R is equal to ________ L∙atm/ K∙mole.

A)0.0821
B)8.21
C)82.1
D)0.00821

Answer 1

0.0821

Question 2

Pressure is defined as ________.

A)the amount of force per unit area
B)the amount of force per unit volume
C)the amount of work per unit area
D)the amount of work per unit volume

Answer 2

the amount of force per unit area

Question 3

For an ideal gas, which pairs of the variables below are directly proportional to each assuming all other variables are kept constant?

A)P and n
B)n and T
C)V and P
D)all of the above

Answer 3

P and n

Question 4

A gas under an initial pressure of 0.60 atm is compressed at constant temperature from 27 L to 3.0 L. The final pressure becomes ________.

A)0.060 atm
B)0.54 atm
C)5.4 atm
D)54 atm

Question 5

855 torr is equal to ________ cm Hg.

A)1.13
B)85.5
C)855
D)8550

Question 6

A gas occupies a volume of 480 mL at 127 °C and 140 mm Hg. What mathematical expression will yield the correct volume at 177 °C and 400 mm Hg?

A)480 × (140/400)× (450/400)
B)480 × (400/140)× (450/400)
C)480 × (140/400)× (400/450)
D)480 × (400/140)× (400/450)

Question 7

STP conditions stand for ________.

A)0 K, 1 atm
B)0 °C, 760 cm Hg
C)0 °C, 760 mm Hg
D)0 K, 76 cm Hg

Question 8

A gas sample occupies a volume of 8 L at 20 °C. The temperature at which the gas would double its volume is ________.

A)40 °C
B)10 °C
C)273 K
D)586 K

Question 9

If the pressure of a given gas sample doubles, what happens to the volume of gas? (Assuming that the amount of gas and the temperature of the gas stay the same).

A)increase by a factor of 2
B)decrease by a factor of 2
C)stay exactly the same

Question 10

1 atm is equal to ________.

A)760 cm Hg
B)760 mm Hg
C)76 torr
D)76 mm Hg

Question 11

0.15 atm is equal to ________.

A)11.4 torr
B)114 torr
C)1.14 × 10^-5 torr
D)1.14 × 10^-3 torr

Question 12

If the pressure of a gas sample is quadrupled and the absolute temperature is doubled, by what factor does the volume of the sample change?

A)2
B)1/2
C)1/4
D)1/8

Question 13

The number of moles of hydrogen gas present in a 1,500 mL container at 298 K and 2.0 atm pressure is ________.

A)0.65
B)0.12
C)0.26
D)0.52

Question 14

How many moles of gas are found in a container that occupies a volume of 5.50 L with a pressure of 0.335 atm at 25 °C?

A)0.0753
B)0.898
C)13.3
D)1.11

Question 15

A gas occupies 2.00 L at 298 K and 2.10 atm. The volume of this quantity of gas at STP conditions is ________.

A)22.4 L
B)2.24 L
C)3.84 L
D)2.00 L

Question 16

Which of the following gases will have the same density at STP?

A)oxygen and methane
B)hydrogen and helium
C)carbon monoxide and nitrogen
D)hydrogen chloride and fluorine

Question 17

For an ideal gas, which pairs of the variables below are inversely proportional to each assuming all other variables are kept constant?

A)P and n
B)V and T
C)V and P
D)V and n

Question 18

A gas occupies a volume of 0.500 L at 125 °C and 0.443 atm. What mathematical expression will yield the correct temperature at 0.750 L and 0.689 atm?

A)(0.689 × 0.750 × 125)/(0.443 × 0.500)
B)(0.443 × 0.500 × 398)/(0.689 × 0.750)
C)(0.443 × 0.500)/(0.689 × 0.750 × 398)
D)(0.689 × 0.750 × 398)/(0.443 × 0.500)

Question 19

380 mm Hg is equal to ________ atm.

A)0.500
B)2.00
C)5.00
D)20.00

Question 20

The volume of 2.3 g nitrogen gas at STP is ________.

A)1.8 L
B)11.2 L
C)22.4 L
D)44.8 L

Question 21

The density of sulfur vapor at 1273 K and 740 torr is 0.5977 g/L. Sulfur at that temperature will be ________.

A)monoatomic
B)diatomic
C)triatomic
D)tetraatomic

Question 22

The volume occupied by 4.00 g oxygen gas at STP is ________.

A)22.4 L
B)11.2 L
C)5.60 L
D)2.80 L

Question 23

The density of carbon tetrachloride at 0.94 atm and 398 K is ________.

A)1.11 g/L
B)2.21 g/L
C)4.43 g/L
D)8.86 g/L

Question 24

Assuming that the pressure and quantity of a gas sample remain constant, what will be the final volume of a 4.86 L sample of a gas originally at 281 °C when heated to 300 °C?

A)5.03 L
B)3.89 L
C)2.92 L
D)2.78 L

Question 25

0.123 g of a gas occupy a volume of 124 mL at 120. °C and 760. torr. The possible formula of the gas is ________.

A)CH₄
B)CO₂
C)Cl₂
D)O₂

Question 26

Assuming that the temperature and quantity of a gas sample remain constant, what will be the final pressure of a 1.6 L sample of a gas originally at 330 K and 4.84 atm, when the volume is reduced
To 840 mL?

A)9.22 atm
B)4.61 atm
C)18.44 atm
D)3.66 atm

Question 27

The density of hydrogen gas at STP is ________ the density of oxygen under identical conditions.

A)four times larger than
B)eight times larger than
C)sixteen times smaller than
D)equal to, since both densities are taken under the same conditions

Question 28

The density of sulfur vapor at 1273 K and 740 torr is 0.5977 g/L. Its molar mass is ________.

A)32
B)64
C)96
D)128

Question 29

The volume of a certain quantity of a gas is 4.23 L at 747 mm Hg at 297 K. The volume occupied by the same quantity of gas under the same temperature and 700. torr is ________.

A)3.96 L
B)4.51 L
C)1.88 L
D)1.68 L

Question 30

An unknown gaseous substance has a density of 1.06 g/L at 31 °C and 371 torr. Its molecular weight is ________.

A)27
B)54
C)81
D)108

Question 31

Which of the following gases occupy the smallest volume at STP?

A)4.032 g H₂
B)1.000 mol of carbon dioxide
C)35.45 g Cl₂
D)6.022 × 10²³ molecules of O₂

Question 32

Which gas has a density equal to 1.43 g/L at STP?

A)nitrogen
B)oxygen
C)helium
D)carbon monoxide

Question 33

The density of carbon dioxide as STP is ________.

A)0.46 g/ L
B)1.97 g/ L
C)3.94 g/ L
D)5.62 g/ L

Question 34

Imagine a balloon that you blow up to a given size (fill with a given amount of air at a given temperature and pressure). What do you expect to happen if you suspend the balloon over a bunsen burner (gas flame)? (Assuming that the pressure does not change significantly).

A)increase significantly in size until it bursts
B)decrease significantly in size
C)stay exactly the same size as before
D)One cannot say unless the composition of the gas is known.

Question 35

0.123 g of a gas occupy a volume of 124 mL at 120. °C and 760. torr. Its molar mass is ________.

A)22.4
B)28
C)71
D)32

Question 36

What weight of nitrogen gas will occupy a volume of 1.25 L at a pressure of 1 atm and a temperature of 200.°C?

A)0.45 g
B)0.90 g
C)1.80 g
D)3.60 g

Question 37

The molar volume of an ideal gas is ________.

A)always equal to 22.4 L at room temperature
B)proportional to the molecular weight of the gas
C)always equal to 22.4 L at STP
D)inversely proportional to the molecular weight of the gas

Question 38

0.249 g of a diatomic element occupies a volume of 125. mL at 120. °C and 2.00 atm. This element is ________.

A)nitrogen
B)oxygen
C)chlorine
D)bromine

Question 39

Imagine a balloon that you blow up to a given size (fill with a given amount of air at a given temperature and pressure). What do you expect to happen if you pour liquid nitrogen (at 77 K)over the surface of the balloon? (Assuming that the pressure does not change significantly).

A)increase slightly in size
B)decrease significantly in size
C)stay exactly the same size as before
D)One cannot say unless the composition of the gas is known.

Question 40

Assuming that the pressure and quantity of a gas sample remain constant, what will be the final volume of a 4.86 L sample of a gas originally at 281 °C when cooled to 225 °C?

A)5.19 L
B)4.37 L
C)2.92 L
D)2.78 L

Question 41

Which statement is true for an ideal gas?

A)The pressure of a gas increases when its volume decreases.
B)The pressure of a gas increases when its temperature increases.
C)The pressure of a gas increases when the number of gas moles increases.
D)All of the above statements are correct.

Question 42

As temperature increases the volume of a gas increases, even if the pressure is not kept constant.

Question 43

The molar volume of any gas is equal to 22.4 L at any temperature.

Question 44

The number of moles of oxygen that are present in a 15-L container at STP is ________.

A)0.1
B)0.67
C)0.89
D)336

Question 45

Increasing the temperature of a gas from 100 °C to 200 °C will cause the volume to double.

Question 46

Find the number of liters occupied by 3.0 moles of nitrogen gas at STP.

A)67 L
B)7.5 L
C)4.8 L
D)0.13 L

Question 47

A gas occupies 340 mL at 273 K and 610 torr. What final temperature would be required to increase the pressure to 1 atm, the volume being held constant?

A)67 °C
B)267 °C
C)340 °C
D)613 °C

Question 48

Find the number of liters occupied by 3.0 g of nitrogen gas at STP.

A)67 L
B)7.5 L
C)2.4 L
D)0.13 L

Question 49

The freezing point of water is 0 K.

Question 50

The molar volume of any gas whether diatomic or monoatomic is 22.4 L at STP.

Question 51

As the volume of a gas is allowed to double, its pressure is halved as long as the temperature is kept constant.

Question 52

88 g of carbon dioxide gas will occupy ________ at STP.

A)11.2 L
B)22.4 L
C)44.8 L
D)67.2 L

Question 53

The pressure of 0.500 atm is equal to 0.500 torr.

Question 54

3.01 x 10²³ molecules of methane gas will occupy ________ at STP.

A)11.2 L
B)22.4 L
C)44.8 L
D)67.2 L

Question 55

14 g of nitrogen gas will occupy ________ at STP.

A)1.12 L
B)2.24 L
C)11.2 L
D)22.4 L

Question 56

The pressure of 2.00 atm is equal to 152 cm Hg.

Question 57

The boiling point of water is 373 K.

Question 58

The typical units for the density of gases are g/L.

Question 59

As the temperature of a gas increases, its pressure increases as long as the volume is kept constant.

Question 60

The molar volume of 32 g of oxygen gas is 22.4 L at STP.

Question 61

947 mbar is equal to 0.933 atm (given 1 atm= 1.015 bar).

Question 62

124 cm Hg is equal to 1.63 atm.

Question 65

1 torr is equal to 1 cm Hg.

Question 66

One of the assumptions taken when dealing with ideal gas law is that most volume occupied by a gas is actually empty space.

Question 67

The molar volume of water vapor at its boiling point is 22.4 L.

Question 71

The ideal gas law may be applied also to a mixture of gases, such as air, assuming that the molecular weight is the average molecular weight of that mixture.

Question 73

The density of nitrogen is equal to that of carbon monoxide at STP.

Question 74

76 cm Hg is equal to 1 atm.

Question 75

30.19 inches of Hg is equal to 1.009 atm.

Question 76

Match each set of two variables of an ideal gas that appears in the questions with the corresponding relationship (proportional or inversely proportional)that appears in the list below.

Question 77

Ideal gas molecules undergo non-elastic collisions.

Question 78

Match the event that appears in the queston to the corresponding consequence that appears in the list below.

Question 79

The density of a gas is independent of temperature increase.

Question 80

0.0309 atm is equal to 23.5 cm Hg.