Deck 5: Gases

Question 1

An instrument used to atmospheric pressure is called a

A) barometer.
B) manometer.
C) sphygmomanometer.
D) spectrophotometer.
E) spectrometer.

Answer 1

barometer.

Question 2

In Lhasa,Tibet,the elevation is 12,000 feet.The altimeter reading in an airplane is 19.00 in Hg.This pressure is equal to ________ psi.

A) 9.33
B) 483
C) 0.635
D) 1.57
E) 23.1

Answer 2

9.33

Question 3

A child receives a helium balloon in a shopping mall.When he goes outside during a snowstorm,the balloon decreases in size.Which gas law is this an example of?

A) Avogadro's Law
B) Ideal Gas Law
C) Charles's Law
D) Boyle's Law
E) Dalton's Law

Answer 3

Charles's Law

Question 4

To what temperature must a balloon,initially at 25°C and 2.00 L,be heated in order to have a volume of 6.00 L?

A) 993 K
B) 403 K
C) 75 K
D) 655 K
E) 894 K

Question 5

A large balloon is initially filled to a volume of 25.0 L at 353 K and a pressure of 2575 mm Hg.What volume of gas will the balloon contain at 1.35 atm and 253 K?

A) 22.2 L
B) 87.5 L
C) 11.4 L
D) 45.0 L
E) 58.6 L

Question 6

In Lhasa,Tibet,the elevation is 12,000 feet.The altimeter reading in an airplane is 19.00 in Hg.This pressure is equal to ________ atm.

A) 9.33
B) 483
C) 0.635
D) 1.57
E) 23.1

Question 7

While traveling,an airplane passenger placed a bag of potato chips in his checked luggage.When he opened the luggage,the bag had exploded and potato chips were everywhere in his luggage.Which gas law is this an example of?

A) Avogadro's Law
B) Ideal Gas Law
C) Charles's Law
D) Boyle's Law
E) Dalton's Law

Question 8

An instrument used to measure the pressure of a gas in a laboratory is called a

A) barometer.
B) manometer.
C) sphygmomanometer.
D) spectrophotometer.
E) spectrometer.

Question 9

In weather,high-pressure systems and low-pressure systems typically go from west to east in the United States.What type of weather does this indicate?

A) No weather is indicated by high pressure or low pressure systems.
B) Both high pressure and low pressure usually indicate clear weather.
C) High pressure usually indicates unstable weather and low pressure usually indicates clear weather.
D) Both high pressure and low pressure usually indicates unstable weather.
E) High pressure usually indicates clear weather and low pressure usually indicates unstable weather.

Question 10

An instrument used to measure blood pressure is called a

A) barometer.
B) manometer.
C) sphygmomanometer.
D) spectrophotometer.
E) spectrometer.

Question 11

What pressure will 14.0 g of CO exert in a 3.5 L container at 75°C?

A) 4.1 atm
B) 5.0 atm
C) 6.4 atm
D) 1.1 atm
E) 2.3 atm

Question 12

The volume of a gas is inversely proportional to the pressure of a gas is known as

A) Avogadro's Law.
B) Ideal Gas Law.
C) Charles's Law.
D) Boyle's Law.
E) Dalton's Law.

Question 13

A sample of gas initially has a volume of 859 mL at 565 K and 2.20 atm.What pressure will the sample have if the volume changes to 268 mL while the temperature is increased to 815 K?

A) 10.2 atm
B) 9.83 atm
C) 15.3 atm
D) 6.53 atm
E) 1.05 atm

Question 14

The volume of a gas is proportional to the temperature of a gas is known as

A) Avogadro's Law.
B) Ideal Gas Law.
C) Charles's Law.
D) Boyle's Law.
E) Dalton's Law.

Question 15

A syringe initially holds a sample of gas with a volume of 285 mL at 355 K and 1.88 atm.To what temperature must the gas in the syringe be heated/cooled in order to have a volume of 435 mL at 2.50 atm?

A) 139 K
B) 572 K
C) 175 K
D) 466 K
E) 721 K

Question 16

Near Cozumel,Mexico,a scuba diver goes down 60 ft to look at the sea creatures.As she descends,the air pressure increases.Which gas law is this an example of?

A) Avogadro's Law
B) Ideal Gas Law
C) Charles's Law
D) Boyle's Law
E) Dalton's Law

Question 17

Define pressure.

A) force used to compress a gas
B) force applied to a gas to condense it
C) force exerted per unit area by gas particles as they strike the surfaces around them
D) force exerted by solids to the surrounding area
E) force used to melt a solid

Question 18

In Lhasa,Tibet,the elevation is 12,000 feet.The altimeter reading in an airplane is 19.00 in Hg.This pressure is equal to ________ torr.

A) 9.33
B) 483
C) 0.635
D) 1.57
E) 23.1

Question 19

The volume of a gas is proportional to number of moles of a gas is known as

A) Avogadro's Law.
B) Ideal Gas Law.
C) Charles's Law.
D) Boyle's Law.
E) Dalton's Law.

Question 20

In Lhasa,Tibet,the elevation is 12,000 feet.The altimeter reading in an airplane is 19.00 in Hg.This pressure is equal to ________ mm Hg.

A) 9.33
B) 483
C) 0.635
D) 1.57
E) 23.14

Question 21

Define hypoxia.

A) oxygen starvation
B) increased oxygen concentration in body tissues
C) increased nitrogen concentration in body tissues and fluids
D) nitrogen starvation

Question 22

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 775 mm Hg,what is the molecular formula of the compound?

A) NO₂
B) N₂O
C) N₄O₂
D) N₂O₅
E) N₂O₄

Question 23

A syringe contains 589 mL of CO at 325 K and 1.2 atm pressure.A second syringe contains 473 mL of N₂ at 298 K and 2.6 atm.What is the final pressure if the contents of these two syringes are injected into a 1.00 L container at 0.00°C?

A) 0.59 atm
B) 1.1 atm
C) 1.7 atm
D) 1.9 atm
E) 3.8 atm

Question 24

What pressure would a gas mixture in a 10.0 L tank exert if it were composed of 48.5 g He and 94.6 g CO₂ at 398 K?

A) 39.6 atm
B) 7.02 atm
C) 32.6 atm
D) 46.6 atm
E) 58.7 atm

Question 25

Determine the volume of O₂ (at STP)formed when 50.0 g of KClO₃ decomposes according to the following reaction.The molar mass for KClO₃ is 122.55 g/mol. 2 KClO₃(s)→ 2 KCl(s)+ 3 O₂(g)

A) 9.14 L
B) 8.22 L
C) 12.3 L
D) 13.7 L
E) 14.6 L

Question 26

To avoid oxygen toxicity and nitrogen narcosis,deep-sea divers breathe a specialized mixture of gas.Describe the mixture.

A) hydrogen and oxygen
B) nitrogen and oxygen
C) helium and oxygen
D) argon and helium
E) nitrogen and helium

Question 27

Determine the theoretical yield and the percent yield if 21.8 g of K₂CO₃ is produced from reacting 27.9 g KO₂ with 29.0 L of CO₂ (at STP).The molar mass of KO₂ = 71.10 g/mol and K₂CO₃ = 138.21 g/mol. 4 KO₂(s)+ 2 CO₂(g)→ 2 K₂CO₃(s)+ 3 O₂(g)

A) 27.1 g, 80.4% yield
B) 179 g, 12.2% yield
C) 91.7 g, 23.8% yield
D) 206 g, 10.6% yield
E) 61.0 g, 35.7% yield

Question 28

The following reaction is used to generate hydrogen gas in the laboratory.If 243 mL of gas is collected at 25°C and has a total pressure of 745 mm Hg,what mass of hydrogen is produced? A possibly useful table of water vapor pressures is provided below. Mg(s)+ 2 HCl(aq)→ MgCl₂(aq)+ H₂(g)T (°C)P (mm Hg)
20 17.55
25 23.78
30 31.86

A) 0.0196 g H₂
B) 0.0717 g H₂
C) 0.0190 g H₂
D) 0.0144 g H₂
E) 0.0449 g H₂

Question 29

A 0.334 g sample of an unknown halogen occupies 109 mL at 398 K and 1.41 atm.What is the identity of the halogen?

A) Br₂
B) F₂
C) Cl₂
D) I₂
E) Ge

Question 30

Determine the density of NH₃ gas at 435 K and 1.00 atm.

A) 2.10 g/L
B) 0.477 g/L
C) 0.321 g/L
D) 2.24 g/L
E) 0.851 g/L

Question 31

How many molecules of XeF₆ are formed from 12.9 L of F₂ (at 298 K and 2.60 atm)according to the following reaction? Assume that there is excess Xe. Xe(g)+ 3 F₂(g)→ XeF₆(g)

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 32

Determine the volume of H₂S (at 375 K and 1.20 atm)needed to produce 55.0 g of S.Assume that there is excess SO₂ present. 2 H₂S(g)+ SO₂(g)→ 3 S(s)+ 2 H₂O(g)

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

Question 33

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

A) 1.53 L
B) 565 L
C) 24.5 L
D) 25.0 L
E) 0.766 L

Question 34

Define vapor pressure.

A) partial pressure of water in a liquid mixture
B) partial pressure of water in a gaseous mixture
C) condensation of water
D) water dissolved in a liquid
E) water molecules

Question 35

The total pressure of a gas mixture is the sum of the partial pressure of its components is known as

A) Avogadro's Law.
B) Ideal Gas Law.
C) Charles's Law.
D) Boyle's Law.
E) Dalton's Law.

Question 36

A 0.465 g sample of an unknown compound occupies 245 mL at 298 K and 1.22 atm.What is the molar mass of the unknown compound?

A) 26.3 g/mol
B) 33.9 g/mol
C) 12.2 g/mol
D) 38.0 g/mol
E) 81.8 g/mol

Question 37

What mass of NO₂ is contained in a 13.0 L tank at 4.58 atm and 385 K?

A) 18.8 g
B) 53.1 g
C) 24.4 g
D) 86.7 g
E) 69.2 g

Question 38

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

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

Question 39

Using the graph below,determine the gas that has the highest density at STP.

A) A
B) B
C) C
D) D
E) All of the gases have the same density at STP.

Question 40

Using the graph below,determine the gas that has the lowest density at STP.

A) A
B) B
C) C
D) D
E) All of the gases have the same density at STP.

Question 41

Determine the mass of water formed when 12.5 L NH₃ (at 298 K and 1.50 atm)is reacted with 18.9 L of O₂ (at 323 K and 1.1 atm). 4 NH₃(g)+ 5 O₂(g)→ 4 NO(g)+ 6 H₂O(g)

A) 17.0 g H₂O
B) 20.7 g H₂O
C) 37.7 g H₂O
D) 13.8 g H₂O
E) 27.9 g H₂O

Question 42

The atmospheric pressure is 715 mm Hg.What is the pressure in torr?

A) 715 torr
B) 28.1 torr
C) 13.5 torr
D) 29.5 torr
E) 760 torr

Question 43

The rate of effusion of two different gases is known as

A) Avogadro's Law.
B) Graham's Law.
C) Charles's Law.
D) Boyle's Law.
E) Dalton's Law.

Question 44

Determine the total volume of all gases (at STP)formed when 50.0 mL of TNT (C₃H₅(NO₃)₃,d = 1.60 g/mL,molar mass = 227.10 g/mol)reacts according to the following reaction. 4 C₃H₅(NO₃)₃(l)→ 6 N₂(g)+ O₂(g)+ 12 CO₂(g)+ 10 H₂O(g)

A) 4.93 L
B) 57.2 L
C) 29.6 L
D) 448 L
E) 175 L

Question 45

Which of the gases in the graph below has the smallest molar mass?

A) A
B) B
C) C
D) D
E) There is not enough information to determine.

Question 46

Convert 2.00 atm to torr.

A) 760 torr
B) 575 torr
C) 1520 torr
D) 1000 torr
E) 2400 torr

Question 47

Which of the following statements is TRUE?

A) Particles of different masses have the same average speed at a given temperature.
B) The larger a molecule, the faster it will effuse.
C) At very high pressures, a gas will occupy a larger volume than predicted by the ideal gas law.
D) For a given gas, the lower the temperature, the faster it will effuse.
E) None of the above statements is true.

Question 48

Give the definition for effusion.

A) gas molecules mix equally
B) gas molecules spread out in a concentration gradient
C) gas molecules escape from a container into a vacuum through a small hole
D) average distance between collisions
E) gas molecules mix unequally

Question 49

Give the definition for diffusion.

A) gas molecules mix equally
B) gas molecules spread out in response to a concentration gradient
C) gas molecules escape from a container into a vacuum through a small hole
D) average distance between collisions
E) gas molecules mix unequally

Question 50

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 752 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) 666 mm Hg
B) 743 mm Hg
C) 761 mm Hg
D) 838 mm Hg

Question 51

Define mean free path.

A) average distance that a molecule travels between collisions
B) diameter of a molecule
C) distance between molecules in a gas
D) time for effusion
E) time for diffusion

Question 52

Which statement is TRUE about kinetic molecular theory?

A) A single particle does not move in a straight line.
B) The size of the particle is large compared to the volume.
C) The collisions of particles with one another is completely elastic.
D) The average kinetic energy of a particle is not proportional to the temperature.

Question 53

This equation is used to calculate the properties of a gas under nonideal conditions.

A) Charles's Law
B) Avogadro's Law
C) Boyle's Law
D) van der Waals equation
E) Dalton's Law

Question 54

Which of the following statements is TRUE?

A) At a given temperature, lighter gas particles travel more slowly than heavier gas particles.
B) The smaller a gas particle, the slower it will effuse
C) The higher the temperature, the lower the average kinetic energy of the sample.
D) At low temperatures, intermolecular forces become important and the pressure of a gas will be lower than predicted by the ideal gas law.
E) None of the above statements is true.

Question 55

Calculate the root mean square velocity of nitrogen molecules at 25°C.

A) 729 m/s
B) 515 m/s
C) 149 m/s
D) 297 m/s

Question 56

Determine the volume of SO₂ (at STP)formed from the reaction of 96.7 g of FeS₂ and 55.0 L of O₂ (at 398 K and 1.20 atm).The molar mass of FeS₂ is 119.99 g/mol. 4 FeS₂(s)+ 11 O₂(g)→ 2 Fe₂O₃(s)+ 8 SO₂(g)

A) 36.1 L
B) 45.3 L
C) 18.1 L
D) 27.6 L
E) 32.9 L

Question 57

Convert 2.00 atm to psi.

A) 59.8 psi
B) 875 psi
C) 29.4 psi
D) 42.0 psi
E) 1520 psi

Question 58

Which of the gases in the graph below has the largest molar mass?

A) A
B) B
C) C
D) D
E) There is not enough information to determine.

Question 59

The atmospheric pressure is 715 mm Hg.What is the pressure in inches of Hg?

A) 15.6 in Hg
B) 0.921 in Hg
C) 14.4 in Hg
D) 28.1 in Hg
E) 32.5 in Hg

Question 60

Convert 2.00 atm to mm Hg.

A) 760 mm Hg
B) 800 mm Hg
C) 1520 mm Hg
D) 1050 mm Hg
E) 1900 mm Hg

Question 61

A fixed amount of gas at 25.0°C occupies a volume of 10.0 L when the pressure is 751 torr.Use Boyle's law to calculate the pressure (torr)when the volume is reduced to 9.25 L at a constant temperature of 25.0°C.

A) 812 torr
B) 0.123 torr
C) 6.95 × torr
D) 695 torr
E) 1.07 torr

Question 62

A syringe contains 0.65 moles of He gas that occupy 900.0 mL.What volume (in L)of gas will the syringe hold if 0.35 moles of Ne is added?

A) 0.48 L
B) 1.7 L
C) 1.4 L
D) 2.6 L
E) 0.80 L

Question 63

A scuba diver experiences ________ as she descends into the ocean water.

A) decrease of 1 atm for each 15 m of depth
B) decrease of 1 atm for each 22 m of depth
C) increase of 1 atm for each 20 m of depth
D) increase of 1 atm for each 10 m of depth
E) no difference in pressure

Question 64

Calculate the temperature,in K,of 2.20 moles of gas occupying 3.70 L at 3.12 atm.

A) 64.0 K
B) -209 K
C) 337 K
D) 28.0 K

Question 65

A basketball is inflated to a pressure of 1.80 atm in a 23.0°C garage.What is the pressure of the basketball outside where the temperature is -2.00°C?

A) 1.65 atm
B) 1.70 atm
C) 1.90 atm
D) 1.97 atm

Question 66

A fixed amount of gas at 25.0°C occupies a volume of 10.0 L when the pressure is 629 torr.Use Charles's law to calculate the volume (L)the gas will occupy when the temperature is increased to while maintaining the pressure at 629 torr.

A) 11.1 L
B) 13.4 L
C) 1.98 L
D) 7.47 L
E) 50.4 L

Question 67

A balloon filled with helium gas at 20°C occupies 5.91 L at 1.00 atm.The balloon is immersed in liquid nitrogen at -196°C,while the pressure is raised to 5.20 atm.What is the volume of the balloon in the liquid nitrogen?

A) 0.30 L
B) 4.3 L
C) 8.1 L
D) 120 L

Question 68

To what volume will a 2.33 L sample of gas expand if it is heated from 30.0°C to 300.0°C?

A) 4.41 L
B) 23.3 L
C) 0.233 L
D) 1.23 L
E) 0.812 L

Question 69

If a sample of 0.29 moles of Ar occupies 4.2 L under certain conditions,what volume will 0.66 moles occupy under the same conditions?

A) 1.8 L
B) 9.6 L
C) 8.0 L
D) 5.0 L
E) 15 L

Question 70

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 4.4 L at 2.2 atm?

A) 3.0 L
B) 1.50 L
C) 9.7 L
D) 6.6 L
E) 2.2 L

Question 71

What volume (in mL)will a sample of F₂ gas occupy in a syringe at 5.5 atm,if the F₂ has a volume of 30.0 mL at 1.2 atm?

A) 138 mL
B) 30 mL
C) 4.0 mL
D) 6.5 mL
E) 1.2 mL

Question 72

The volume of 350.mL of gas at 25°C is decreased to 125 mL at constant pressure.What is the final temperature of the gas?

A) -167°C
B) 8.9°C
C) 70°C
D) 561°C

Question 73

If the pressure in a gas container that is connected to an open-end U-tube manometer is 126 kPa and the pressure of the atmosphere at the open end of the tube is 732 mm Hg,the level of mercury in the tube will

A) be 213 mm higher in the arm open to the atmosphere.
B) be 213 mm higher in the arm connected to the gas cylinder.
C) be 945 mm higher in the arm open to the atmosphere.
D) be 925 mm higher in the arm connected to the gas cylinder.

Question 74

A gas occupies 2.22 L at 3.67 atm.What is the volume at 1.94 atm?

A) 1.17 L
B) 3.21 L
C) 4.21 L
D) 34.3 L
E) 0.289 L

Question 75

How many moles of CO are contained in a 5.00 L tank at 155°C and 2.80 atm?

A) 0.399 moles
B) 1.10 moles
C) 2.51 moles
D) 0.455 moles
E) 0.289 moles

Question 76

A sample of 0.400 moles of nitrogen occupies 0.800 L.Under the same conditions,what number of moles occupies 1.200 L?

A) 0.600 moles
B) 0.417 moles
C) 2.40 moles
D) 0.216 moles

Question 77

What pressure will 2.6 × 10²³ molecules of Rn exert in a 3.9 L container at 45°C?

A) 5.5 atm
B) 1.7 atm
C) 2.9 atm
D) 3.4 atm
E) 4.6 atm

Question 78

A container filled with gas is connected to an open-end manometer that is filled with mineral oil.The pressure in the gas container is 763 mm Hg and atmospheric pressure is 734 mm Hg.How high will the level rise in the manometer if the densities of Hg and mineral oil are 13.6 g/mL and 0.822 g/mL respectively?

A) 1.75 mm
B) 23.8 mm
C) 29.0 mm
D) 480 mm

Question 79

What pressure (in atm)will 0.44 moles of Br₂ exert in a 2.6 L container at 25°C?

A) 0.35 atm
B) 4.1 atm
C) 4.7 atm
D) 8.6 atm
E) 3.6 atm

Question 80

A gas is at 35.0°C and 2.50 L.What is the temperature of the gas if the volume is increased to 5.00 L?

A) 343°C
B) 70.0°C
C) 616°C
D) 1.16°C
E) 17.5°C