Deck 11: Gases

Question 1

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.

Answer 1

Avogadro's Law.

Question 2

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.

Answer 2

A

Question 3

A syringe contains 0.65 moles of He gas that occupy 750.0 mL.What volume (in L)of gas will the syringe hold if 0.35 moles of Ne is added?

A) 0.87 L
B) 4.9 L
C) 1.2 L
D) 2.1 L
E) 1.9 L

Answer 3

1.2 L

Question 4

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

A) decrease of 1 atm for each 20 m of depth
B) decrease of 1 atm for each 10 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 5

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 6

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 7

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 8

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 9

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 10

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 11

An instrument used to measure blood pressure is called a

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

Question 12

An instrument used to measure atmospheric pressure is called a

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

Question 13

Which of the following will cause the volume of an ideal gas to triple in value?

A) raising the temperature from 25°C to 75°C at constant pressure
B) lowering the absolute temperature by a factor of 3 at constant pressure
C) raising the absolute temperature by a factor of 3 while increasing the pressure by a factor of 3
D) lowering the absolute temperature by a factor of 3 while increasing the pressure by a factor of 3
E) lowering the pressure by a factor of 3 while the temperature stays constant

Question 14

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 15

If a sample of 0.29 moles of Ar occupies 3.8 L under certain conditions,what volume will 0.66 moles occupy under the same conditions?

A) 12 L
B) 8.6 L
C) 17 L
D) 5.0 L
E) 15 L

Question 16

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

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

Question 17

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 18

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 19

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 25.0 mL at 1.2 atm?

A) 11 mL
B) 17 mL
C) 3.8 mL
D) 5.5 mL
E) 7.6 mL

Question 20

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 21

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 22

Give the definition for diffusion.

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 23

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 24

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 25

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 26

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 27

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 28

Determine the density of CO₂ gas at STP.

A) 1.96 g/L
B) 1.80 g/L
C) 2.24 g/L
D) 4.46 g/L
E) 5.10 g/L

Question 29

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 30

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 31

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 32

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 33

A mixture of 1.0 mol He and 1.0 mol Ne are at STP in a rigid container.Which of the following statements is TRUE?

A) Both gases have the same average kinetic energy.
B) Both gases contribute equally to the density of the mixture under these conditions.
C) Both gases have the same molecular speed.
D) The mixture has a volume of 22.4 L
E) All of the above are true.

Question 34

A gas mixture consists of N₂,O₂,and Ne,where the mole fraction of N₂ is 0.55 and the mole fraction of Ne is 0.25.If the mixture is at STP in a 5.0 L container,how many molecules of O₂ are present?

A) 4.5 × 10²² molecules O₂
B) 2.7 × 10²² molecules O₂
C) 3.7 × 10²³ molecules O₂
D) 1.1 × 10²³ molecules O₂
E) 9.3 × 10²⁴ molecules O₂

Question 35

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 36

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 37

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 273 K?

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

Question 38

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 39

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 of the particle.
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 40

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 41

The rate of effusion of argon to an unknown gas is 1.194.What is the other gas?

A) oxygen
B) nitrogen
C) neon
D) krypton
E) hydrogen

Question 42

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 43

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 44

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 45

All of the following statements concerning real cases is correct EXCEPT

A) molecules of real gases are attracted to each other.
B) molecules of real gases occupy no volume.
C) the pressure of a real gas at low temperatures is lower than for ideal gases.
D) the pressure of a real gas is due to collisions with the container.
E) nonideal gas behavior is described by the Van der Waals Equation.

Question 46

Which one of these will diffuse the fastest at 25°C?

A) 2.0 M Ar
B) 1.0 M H₂
C) 2.0 M N₂
D) 0.5 M Ne
E) 2.0 M O₂

Question 47

Which of the following compounds will behave LEAST like an ideal gas at low temperatures?

A) He
B) SO₂
C) H₂
D) N₂
E) F₂

Question 48

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 49

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 50

What is the volume of 0.700 mol of neon gas at a pressure of 609.5 mm Hg and 117°C?

A) 0.0941 L
B) 13.5 L
C) 2.13 L
D) 27.9 L
E) 0.138 L

Question 51

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 are true.

Question 52

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 53

Which of the following gases has the largest density at STP?

A) He
B) C₂H₂
C) F₂
D) N₂
E) H₂

Question 54

The rate of effusion of oxygen to an unknown gas is 0.935.What is the other gas?

A) Ne
B) Ar
C) F₂
D) N₂

Question 55

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 56

Arrange the gases according to increasing rate of diffusion at 50°C.

A) NO₂ < O₂ < SO₂
B) O₂ < NO₂ < SO₂
C) O₂ < SO₂ < NO₂
D) SO₂ < O₂ < NO₂
E) SO₂ < NO₂ < O₂

Question 57

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 are true.

Question 58

A sample of nitrogen gas is placed in a sealed chamber,and the temperature is increased from 25°C to 125°C under constant pressure.The volume of the sample must

A) increase.
B) decrease.
C) remain constant.
D) None of these are possible.

Question 59

What volume of water is produced when 38.5 g of ethanol reacts with oxygen at 500°C at 1.75 atm?
CH₃CH₂OH(g)+ 3 O₂(g)→ 2 CO₂(g)+ 3 H₂O(g)

A) 91.0 L
B) 58.7 L
C) 103 L
D) 30.3 L
E) 12.5 L

Question 60

If 2.0 mol of gas A is mixed with 1.0 mol of gas B to give a total pressure of 1.6 atm,what is the partial pressure of gas A and B?

A) P_A = 0.33 atm and P_B = 0.67 atm
B) P_A = 0.67 atm and P_B = 0.33 atm
C) P_A = 1.0 atm and P_B = 2.0 atm
D) P_A = 2.0 atm and P_B = 1.0 atm
E) P_A = 1.06 atm and P_B = 0.53 atm

Question 61

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

A) 715 torr
B) 28.1 torr
C) 13.8 torr
D) 31.8 torr
E) 760 torr

Question 62

A sample of 0.200 moles of nitrogen occupies 0.400 L.Under the same conditions,what number of moles occupies 1.200 L?

A) 0.600 moles
B) 0.0667 moles
C) 2.40 moles
D) 0.0960 moles

Question 63

The atmospheric pressure is 700 mm Hg.What is the pressure in inches of Hg?

A) 16.0 in Hg
B) 0.921 in Hg
C) 13.5 in Hg
D) 27.6 in Hg
E) 32.5 in Hg

Question 64

Convert 1.75 atm to psi.

A) 52.4 psi
B) 875 psi
C) 25.7 psi
D) 1000 psi
E) 1330 psi

Question 65

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 753 mm Hg and atmospheric pressure is 724 mm.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 66

Convert 1.50 atm to mm Hg.

A) 760 mm Hg
B) 875 mm Hg
C) 1140 mm Hg
D) 1000 mm Hg
E) 1520 mm Hg

Question 67

A gas occupies 4.23 L at 2.25 atm.What is the volume at 3.46 atm?

A) 6.50 L
B) 1.84 L
C) 2.75 L
D) 32.9 L
E) 0.364 L

Question 68

To what volume will a sample of gas expand if it is heated from 50.0^∘C and 2.33 L to 500.0°C?

A) 5.58 L
B) 23.3 L
C) 0.233 L
D) 0.97 L
E) 0.184 L

Question 69

If the pressure in a gas container that is connected to an open-end U-tube manometer is 116 kPa and the pressure of the atmosphere at the open end of the tube is 752 mm Hg,the level of mercury in the tube will

A) be 118 mm higher in the arm open to the atmosphere.
B) be 118 mm higher in the arm connected to the gas cylinder.
C) be 870 mm higher in the arm open to the atmosphere.
D) be 870 mm higher in the arm connected to the gas cylinder.

Question 70

For a given set of conditions,a sample of 0.95 moles of Kr occupies 5.20 L.How many moles of Kr will occupy 24.8 L under the same conditions?

A) 7.42 mol
B) 0.0221 mol
C) 10.5 mol
D) 4.53 mol
E) 3.58 mol

Question 71

How many moles of nitrogen will react with 380 mL of hydrogen at -30°C and 200 mm Hg?
N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

A) 0.0150 mol
B) 0.00782 mol
C) 0.00501 mol
D) 0.00167 mol
E) 0.0382 mol

Question 72

A 7.82 L gas cylinder contains 28.6 g of O2 and 79.5 g of Xe at 70°C.What is the pressure exerted by the gas?

A) 1.10 atm
B) 8.63 atm
C) 6.92 atm
D) 3.28 atm
E) 5.41 atm

Question 73

A sample of neon at 30.5°C exerts a pressure of 701 mm Hg? What is its density?

A) 0.747 g/mL
B) 563 g/mL
C) 7.42 g/mL
D) 1.38 g/mL
E) 0.482 g/mL

Question 74

What is the temperature of 100.8 g of N₂ that exerts a pressure of 23.8 atm in a 6.51 L container?

A) 524K
B) 489K
C) 778K
D) 261K
E) 340K

Question 75

Convert 1.50 atm to torr.

A) 760 torr
B) 875 torr
C) 1140 torr
D) 1000 torr
E) 1520 torr

Question 76

What is the temperature of 144.32 g of O₂ found in a 5.00L container kept at a pressure of 3.28 atm assuming it behaves as a real gas?

A) 44.3 K
B) 57.5 K
C) 102 K
D) 219 K
E) 328 K

Question 77

A sample of CO₂ gas fills a container with a volume of 44.5 L.When the volume is decreased to 13.8 L at a constant temperature,the pressure inside the container is 6.25 atm.What was the pressure inside the container originally?

A) 0.035 atm
B) 0.51 atm
C) 1.94 atm
D) 3.84 atm
E) 6.25 atm

Question 78

A sample of 1.58 g of an unknown gas has a volume of 0.682 L.The sample is kept at 60°C,and exerts a pressure of 1.38 atm.What is the gas?

A) Cl₂
B) NO
C) NO₂
D) SO₂
E) C₂H₆

Question 79

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 742 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) 656 mm Hg
B) 733 mm Hg
C) 751 mm Hg
D) 828 mm Hg

Question 80

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 8.8 L at 4.4 atm?

A) 2.0 L
B) 0.50 L
C) 39 L
D) 13 L
E) 4.4 L