Deck 5: Gases

Question 1

Which of the following compounds is an EPA principal pollutant?

A) O₂
B) NO₂
C) H₂O
D) N₂

Answer 1

NO₂

Question 2

At absolute zero, only monatomic hydrogen maintains some degree of movement.

Answer 2

False

Question 3

CO, NO₂, O₃, and SO₂ are among the EPA's six principal criteria pollutants.

Answer 3

True

Question 4

According to Boyle's Law, at constant temperature, pressure and volume are inversely proportional.

Question 5

A pressure of 20.6 kPa corresponds to a pressure reading of:

A) 65.2 mm Hg
B) 111 mm Hg
C) 97.8 mm Hg
D) 155 mm Hg

Question 6

If 3.2 L of CO₂ is contained at a pressure of 1.08 atm, the gas will have a pressure of ____ if the volume is increased to 5.1 L at a constant temperature.

A) 1.7 atm
B) 0.68 atm
C) 1.2 atm
D) 0.83 atm

Question 7

One of the key components to the Kinetic Molecular Theory is the statement that the average kinetic energy of the particles in a gas is proportional to the absolute temperature of the gas, and does not depend on the identity of the gas.

Question 8

Dalton's Law of Partial Pressures states that the pressure of a mixture of gases is the sum of the partial pressures of the component gases.

Question 9

As the temperature of a gas increases with a constant volume, the pressure of the gas will:

A) increase
B) remain the same
C) decrease
D) fluctuate about the original mean

Question 10

If a gas stored in a fixed metal cylinder is heated, the pressure inside the cylinder will:

A) increase
B) remain the same
C) decrease
D) fluctuate about the original mean

Question 11

Avagadro's Law states that the volume of a gas is inversely proportional to the number of molecules (or moles) of gas present.

Question 12

Charles' Law states that, as the temperature of a gas increases under constant pressure, the volume of the gas will decrease.

Question 13

Ozone is created in a series of reactions and events involving photochemically activated nitrogen oxides and:

A) Ar
B) H₂
C) VOCs
D) PAHs

Question 14

Assuming a constant temperature, the volume of a gas will ____ with an increase in pressure.

A) increase
B) remain the same
C) decrease
D) fluctuate about the original mean

Question 15

Before heading out onto the lake for a fishing trip, an angler checks the barometer. The pressure reads 29.82 inches of Hg. This corresponds to a pressure in atm of:

A) 0.605 atm
B) 15.6 atm
C) 311 atm
D) 0.997 atm

Question 16

The SI unit for pressure is:

A) psi
B) Pa
C) ft-lb
D) N

Question 17

The collapse of a helium balloon as it leaves the warmth of a florist shop for a sub-zero February morning is best explained by Charles' Law.

Question 18

VOCs play a role in the formation of ozone by reacting with photochemically activated nitrogen oxides.

Question 19

Which of the following is not a property of a gas?

A) expansion to fill the volume of their container
B) densities much lower than solids and liquids
C) characteristic odors detected by the human olfactory
D) the ability to change volumes with temperature fluctuations

Question 20

A mole of any gaseous species occupies 22.4 L at standard temperature and pressure.

Question 21

A particular pair of human lungs have a volume of 2 L when inflated. At this volume, the temperature inside the lungs is 98.6 ° F. If the temperature of the air outside the lung is 45.0 ° F, what volume of cooler outside air is being inhaled and warmed?

A) 0.4 L
B) 0.9 L
C) 1.4 L
D) 1.8 L

Question 22

At constant temperature and volume, 3.8 × 10 ^{− 3} mol of helium is added to a 1.0 L sample of xenon at 0.081 atm and 325 K. What is the total pressure of the gas mix?

A) 0.072 atm
B) 0.18 atm
C) 0.21 atm
D) 0.25 atm

Question 23

A motorist discovers that her auto tire measures 29.2 psi rather than the recommended 35 psi. If the tire's volume is assumed constant at 11.6 L and the temperature is 45F at the filling station, how many moles of air will the motorist need to add to bring the tire to 35 psi? (assume 1.00 atm = 14.7 psi)

A) 1.0 moles
B) 1.2 moles
C) 2.0 moles
D) 2.4 moles

Question 24

During a manufacturer process, a pocket of gases at 250 ° C formed a bubble inside of a liquid mass. The bubble had a volume of 325 mL at the time of it's formation. What is the volume of this bubble now that the product is in a 20 ° C storage facility?

A) 26 mL
B) 84 mL
C) 117 mL
D) 182 mL

Question 25

A temperature of 400 K corresponds to a temperature of:

A) 200 ° C
B) − 73 ° C
C) 673 ° C
D) 127 ° C

Question 26

If a deep-sea diver ascends to the surface (1 atm) from a pressure of 5 atm, the volume of the dissolved gas bubbles in the diver's blood will increase by a factor of ____ during the ascent.

A) 1
B) 5
C) 10
D) remain the same

Question 27

Consider the commercial production of SO₃ via sulfur dioxide and oxygen:
SO₂ (g) + O₂ (g) → SO₃ (g)
If 5.3 L of sulfur dioxide and 4.7 L of oxygen are mixed, how much sulfur trioxide may be produced if all gases are at STP?

A) 5.3 L
B) 6.1 L
C) 10.0 L
D) 21 L

Question 28

The density (in g/L) of helium (He) gas at 694 torr and 719 K is:

A) 0.0619 g/L
B) 3.81 g/L
C) 2.06 g/L
D) 0.206 g/L

Question 29

What is the mass of 2.3 L of chlorine gas at STP?

A) 3.6 g
B) 16.1 g
C) 7.3 g
D) 8.1 g

Question 30

A 2.0 L vessel is filled with 7.3 × 10 ^{− 2} mol hydrogen at 1.55 atm. What is the temperature of this gas?

A) 640 K
B) 1200 K
C) 520 K
D) 2800 K

Question 31

The density (in g/L) of xenon (Xe) gas at 540 torr and 1150 K is:

A) 0.988 g/L
B) 1.26 g/L
C) 1.73 g/L
D) 2.56 g/L

Question 32

Carbon dioxide gas is collected in a laboratory experiment to determine the molar mass of the compound. At 294 K and 1.01 atm, 1.008 grams of CO₂ was collected when a 500 mL flask was filled with the evolved CO₂. What is the experimental molar mass of CO₂?

A) 41.5 g/mol
B) 44.0 g/mol
C) 46.9 g/mol
D) 48.2 g/mol

Question 33

An unknown volatile liquid is vaporized at 110 ° C and 0.920 atm. If the vaporization gives 271 mL of vapor with a mass of 1.314 g, what is the molar mass of this compound?

A) 0.886 g/mol
B) 1.62 g/mol
C) 73.9 g/mol
D) 166 g/mol

Question 34

An argon gas sample has a mass of 1.9511 g and occupies a volume of 5.000 L at 20.0 ° C. What is the pressure of this gas?

A) 8.33 × 10² atm
B) 0.316 atm
C) 1.03 atm
D) 0.234 atm

Question 35

A fertilizer manufacturer uses the reaction between hydrogen and nitrogen to create ammonia (assume no other reactants or products). If 9.5 × 10³ moles of hydrogen and 1.7 × 10³ moles of nitrogen react at 277 K and 1.25 atm, what volume of ammonia is produced?

A) 2.1 × 10⁴ L
B) 3.0 × 10⁴ L
C) 6.2 × 10⁴ L
D) 1.9 × 10⁵ L

Question 36

How many moles of an ideal gas are present in a 50.6 L sample at 35 ° C and 875 torr?

A) 1.95 mol
B) 2.30 mol
C) 4.63 mol
D) 13.6 mol

Question 37

A 2.5 L helium balloon is filled at a florist's shop. If the temperature inside the shop is 68 ° F, what volume will the helium occupy after being left in an automobile at − 5 ° F in the parking lot for the day?

A) 1.6 L
B) − 0.18 L
C) 2.1 L
D) 5.0 L

Question 38

What is the total pressure of a 20.0 L vessel at 30.0 ° C holding 11.6 g N₂, 6.8 g O₂, and 5.3 g of He?

A) 1.6 atm
B) 2.0 atm
C) 2.4 atm
D) 3.2 atm

Question 39

If an angioplasty balloon has a volume of 0.85 cm³ and contains an inert gas mixture at 0.95 atm at room temperature (20 ° C), what is the resulting pressure of the balloon if the temperature is increased to 37 ° C and the volume reduced to 0.50 cm³?

A) 1.2 atm
B) 1.1 atm
C) 1.7 atm
D) 1.0 atm

Question 40

A piston is holding 125 mL of gases at a temperature of 300 K and a pressure of 2.39 atm. What is the volume of the gases if the temperature is increased to 500K and the pressure falls to 2.15 atm?

A) 125 mL
B) 139 mL
C) 208 mL
D) 231 mL

Question 41

What is the partial pressure of hydrogen in a 100.0 L vessel at 10.0 ° C holding 11.6 g H₂, 6.8 g Ar, and 5.3 g of He?

A) 1.6 atm
B) 1.3 atm
C) 2.4 atm
D) 5.7 atm

Question 42

As the temperature of a gas increases, the area under the Maxwell-Boltzmann distribution of molecular speeds curve:

A) increases
B) remains the same
C) decreases
D) multiplies by a constant

Question 43

The ideal gas law begins to break down:

A) as the attractive forces between molecules become significant
B) at low temperatures
C) at high pressures
D) all of the above

Question 44

The average distance a particle travels between collisions with other particles is the:

A) mean free path
B) average kinetic energy
C) Van Deemter distance
D) Bosman span

Question 45

For the gas molecules involved, increasing the energy of gas molecules results in:

A) a temperature decrease
B) an increase in container wall collisions
C) a pressure decrease
D) a decrease in molecular collision frequency