Question 1

How many grams of F2 gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

Accepted Answer

A) 19.5 g 
B) 41.1 g 
C) 500 g 
D) 2.96 × 104 g 
A) 19.5 g 
B) 41.1 g 
C) 500 g 
D) 2.96 × 104 g

Question 2

Zinc reacts with aqueous sulfuric acid to form hydrogen gas:
Zn(s)+ H2SO4(aq)→ ZnSO4(aq)+ H2(g)
In an experiment,201 mL of wet H2 is collected over water at 27°C and a barometric pressure of 733 torr.The vapor pressure of water at 27°C is 26.74 torr.The partial pressure of hydrogen in this experiment is ________ atm.

Accepted Answer

A) 0.929 
B) 706 
C) 0.964 
D) 760 
E) 1.00 
A) 0.929 
B) 706 
C) 0.964 
D) 760 
E) 1.00

Question 3

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

Accepted Answer

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

Question 4

How many liters of hydrogen gas can be generated by reacting 9.25 grams of barium hydride with water at 20°C and 755 mm Hg pressure according to the chemical equation shown below?
BaH2(s)+ 2 H2O(l)→ Ba(OH)2(aq)+ 2 H2(g)

Accepted Answer

A) 0.219 L 
B) 0.799 L 
C) 1.60 L 
D) 3.21 L 
A) 0.219 L 
B) 0.799 L 
C) 1.60 L 
D) 3.21 L

Question 5

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

Accepted Answer

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

Question 6

A fixed amount of gas at 25.0°C occupies a volume of 10.0 L when the pressure is 667 torr.Use Boyle's law to calculate the pressure (torr)when the volume is reduced to 7.88 L at a constant temperature of 25.0°C.

Accepted Answer

A) 846 torr 
B) 0.118 torr 
C) 5.26 × 104 torr 
D) 526 torr 
E) 1.11 torr 
A) 846 torr 
B) 0.118 torr 
C) 5.26 × 104 torr 
D) 526 torr 
E) 1.11 torr

Question 7

What is the total volume of hydrogen gas and oxygen gas that can be produced from the thermal decomposition of 0.0425 grams of H2O2 at 700°C and 755 mm Hg according to the chemical equation shown below?
H2O2(l)→ H2(g)+ O2(g)?

Accepted Answer

A) 50.2 mL 
B) 100 mL 
C) 151 mL 
D) 201 mL 
A) 50.2 mL 
B) 100 mL 
C) 151 mL 
D) 201 mL

Question 8

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?

Accepted Answer

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 
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 9

How many grams of water are required to produce 5.50 L of hydrogen gas at 25.0°C and 755 mm Hg pressure according to the chemical equation shown below?
BaH2(s)+ 2 H2O(l)→ Ba(OH)2(aq)+ 2 H2(g)

Accepted Answer

A) 2.01 g 
B) 4.02 g 
C) 4.07 g 
D) 8.04 g 
A) 2.01 g 
B) 4.02 g 
C) 4.07 g 
D) 8.04 g

Question 10

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

Accepted Answer

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 
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 11

A 0.286-g sample of gas occupies 125 mL at 60.cm of Hg and 25°C.What is the molar mass of the gas?

Accepted Answer

A) 5.9 g/mol 
B) 44 g/mol 
C) 59 g/mol 
D) 71 g/mol 
A) 5.9 g/mol 
B) 44 g/mol 
C) 59 g/mol 
D) 71 g/mol

Question 12

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?

Accepted Answer

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

Question 13

A 4.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure.What is the final pressure in the flask if an additional 2.00 g of N2 gas is added to the flask and the flask cooled to -55°C?

Accepted Answer

A) 0.319 atm 
B) 1.05 atm 
C) 1.44 atm 
D) 1.96 atm 
A) 0.319 atm 
B) 1.05 atm 
C) 1.44 atm 
D) 1.96 atm

Question 14

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 7.6 L at 3.8 atm?

Accepted Answer

A) 2.0 L 
B) 5.0 L 
C) 29 L 
D) 35 L 
E) 17 L 
A) 2.0 L 
B) 5.0 L 
C) 29 L 
D) 35 L 
E) 17 L

Question 15

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?

Accepted Answer

A) NO2 
B) N2O 
C) N4O2 
D) N2O5 
E) N2O4 
A) NO2 
B) N2O 
C) N4O2 
D) N2O5 
E) N2O4

Question 16

Why doesn't Dalton's Law of Partial Pressures depend on the identity of the gases present?

Accepted Answer

It is assumed that all gas particles are

Question 17

What pressure (in atm)will 0.44 moles of CO2 exert in a 2.6 L container at 25°C?

Accepted Answer

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

Question 18

What is the average speed (actually the root-mean-square speed)of a neon atom at 27°C?

Accepted Answer

A) 5.78 m/s 
B) 19.3 m/s 
C) 183 m/s 
D) 609 m/s 
A) 5.78 m/s 
B) 19.3 m/s 
C) 183 m/s 
D) 609 m/s

Question 19

What is the total pressure in a 6.00-L flask which contains 0.127 mol of H2(g)and 0.288 mol of N2(g)at 20.0°C?

Accepted Answer

A) 0.510 atm 
B) 0.681 atm 
C) 1.16 atm 
D) 1.66 atm 
A) 0.510 atm 
B) 0.681 atm 
C) 1.16 atm 
D) 1.66 atm

Question 20

Three gases are filled in three containers of same size.The properties of gases are given below.
 
What is different in these containers?

Accepted Answer

A) mass of gas 
B) number of gas molecules 
C) volume of gas 
D) nothing is different 
A) mass of gas 
B) number of gas molecules 
C) volume of gas 
D) nothing is different

How many grams of F₂ gas are there in a 5.00-L cylinder at 4.00 × 10³ mm Hg and 23°C?

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

How many liters of hydrogen gas can be generated by reacting 9.25 grams of barium hydride with water at 20°C and 755 mm Hg pressure according to the chemical equation shown below? BaH₂(s)+ 2 H₂O(l)→ Ba(OH)₂(aq)+ 2 H₂(g)

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

A fixed amount of gas at 25.0°C occupies a volume of 10.0 L when the pressure is 667 torr.Use Boyle's law to calculate the pressure (torr)when the volume is reduced to 7.88 L at a constant temperature of 25.0°C.

What is the total volume of hydrogen gas and oxygen gas that can be produced from the thermal decomposition of 0.0425 grams of H₂O₂ at 700°C and 755 mm Hg according to the chemical equation shown below? H₂O₂(l)→ H₂(g)+ O₂(g)?

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?

How many grams of water are required to produce 5.50 L of hydrogen gas at 25.0°C and 755 mm Hg pressure according to the chemical equation shown below? BaH₂(s)+ 2 H₂O(l)→ Ba(OH)₂(aq)+ 2 H₂(g)

A 0.286-g sample of gas occupies 125 mL at 60.cm of Hg and 25°C.What is the molar mass of the gas?

A 4.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure.What is the final pressure in the flask if an additional 2.00 g of N₂ gas is added to the flask and the flask cooled to -55°C?

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 7.6 L at 3.8 atm?

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?

Why doesn't Dalton's Law of Partial Pressures depend on the identity of the gases present?

What pressure (in atm)will 0.44 moles of CO₂ exert in a 2.6 L container at 25°C?

What is the average speed (actually the root-mean-square speed)of a neon atom at 27°C?

What is the total pressure in a 6.00-L flask which contains 0.127 mol of H₂(g)and 0.288 mol of N₂(g)at 20.0°C?

Three gases are filled in three containers of same size.The properties of gases are given below. What is different in these containers?

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

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Exam 5: Gases

How many grams of F2 gas are there in a 5.00-L cylinder at 4.00 × 103 mm Hg and 23°C?

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

How many liters of hydrogen gas can be generated by reacting 9.25 grams of barium hydride with water at 20°C and 755 mm Hg pressure according to the chemical equation shown below? BaH2(s)+ 2 H2O(l)→ Ba(OH)2(aq)+ 2 H2(g)

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

A fixed amount of gas at 25.0°C occupies a volume of 10.0 L when the pressure is 667 torr.Use Boyle's law to calculate the pressure (torr)when the volume is reduced to 7.88 L at a constant temperature of 25.0°C.

What is the total volume of hydrogen gas and oxygen gas that can be produced from the thermal decomposition of 0.0425 grams of H2O2 at 700°C and 755 mm Hg according to the chemical equation shown below? H2O2(l)→ H2(g)+ O2(g)?

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?

How many grams of water are required to produce 5.50 L of hydrogen gas at 25.0°C and 755 mm Hg pressure according to the chemical equation shown below? BaH2(s)+ 2 H2O(l)→ Ba(OH)2(aq)+ 2 H2(g)

A 0.286-g sample of gas occupies 125 mL at 60.cm of Hg and 25°C.What is the molar mass of the gas?

A 4.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure.What is the final pressure in the flask if an additional 2.00 g of N2 gas is added to the flask and the flask cooled to -55°C?

What volume will a balloon occupy at 1.0 atm,if the balloon has a volume of 7.6 L at 3.8 atm?

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?

Why doesn't Dalton's Law of Partial Pressures depend on the identity of the gases present?

What pressure (in atm)will 0.44 moles of CO2 exert in a 2.6 L container at 25°C?

What is the average speed (actually the root-mean-square speed)of a neon atom at 27°C?

What is the total pressure in a 6.00-L flask which contains 0.127 mol of H2(g)and 0.288 mol of N2(g)at 20.0°C?

Three gases are filled in three containers of same size.The properties of gases are given below. What is different in these containers?

Matter, Measurement, and Problem Solving

Atoms and Elements

Molecules, Compounds and Chemical Equations

Chemical Quantities and Aqueous Reactions

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, Valence Bond Theory, and

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Filters

How many grams of F₂ gas are there in a 5.00-L cylinder at 4.00 × 10³ mm Hg and 23°C?

How many liters of hydrogen gas can be generated by reacting 9.25 grams of barium hydride with water at 20°C and 755 mm Hg pressure according to the chemical equation shown below? BaH₂(s)+ 2 H₂O(l)→ Ba(OH)₂(aq)+ 2 H₂(g)

What is the total volume of hydrogen gas and oxygen gas that can be produced from the thermal decomposition of 0.0425 grams of H₂O₂ at 700°C and 755 mm Hg according to the chemical equation shown below? H₂O₂(l)→ H₂(g)+ O₂(g)?

How many grams of water are required to produce 5.50 L of hydrogen gas at 25.0°C and 755 mm Hg pressure according to the chemical equation shown below? BaH₂(s)+ 2 H₂O(l)→ Ba(OH)₂(aq)+ 2 H₂(g)

A 4.00-L flask contains nitrogen gas at 25°C and 1.00 atm pressure.What is the final pressure in the flask if an additional 2.00 g of N₂ gas is added to the flask and the flask cooled to -55°C?

What pressure (in atm)will 0.44 moles of CO₂ exert in a 2.6 L container at 25°C?

What is the total pressure in a 6.00-L flask which contains 0.127 mol of H₂(g)and 0.288 mol of N₂(g)at 20.0°C?