Question 1

In a weather forecast on a Seattle radio station the barometric pressure was reported to be 29.4 inches. What is this pressure in SI units? (1 inch = 25.4 mm, 1 atm = 760 mmHg)

Accepted Answer

The answer of In a weather forecast on a Seattle...

Question 2

Which of these gas molecules have the highest average kinetic energy at 25°C?

Accepted Answer

A) H2 
B) O2 
C) N2 
D) Cl2 
E) All the gases have the same average kinetic energy. 
A) H2 
B) O2 
C) N2 
D) Cl2 
E) All the gases have the same average kinetic energy.

Question 3

A spacecraft is filled with 0.500 atm of N2 and 0.500 atm of O2. Suppose a micrometeor strikes this spacecraft and puts a very small hole in it's side. Under these circumstances,

Accepted Answer

A) O2 is lost from the craft 6.9% faster than N2 is lost. 
B) O2 is lost from the craft 14% faster than N2 is lost. 
C) N2 is lost from the craft 6.9% faster than O2 is lost. 
D) N2 is lost from the craft 14% faster than O2 is lost. 
E) N2 and O2 are lost from the craft at the same rate. 
A) O2 is lost from the craft 6.9% faster than N2 is lost. 
B) O2 is lost from the craft 14% faster than N2 is lost. 
C) N2 is lost from the craft 6.9% faster than O2 is lost. 
D) N2 is lost from the craft 14% faster than O2 is lost. 
E) N2 and O2 are lost from the craft at the same rate.

Question 4

If 30.0 L of oxygen are cooled from 200ºC to 1°C at constant pressure, what is the new volume of oxygen?

Accepted Answer

A) 0.150 L 
B) 17.4 L 
C) 23.0 L 
D) 51.8 L 
E) 6.00 * 103 L 
A) 0.150 L 
B) 17.4 L 
C) 23.0 L 
D) 51.8 L 
E) 6.00 * 103 L

Question 5

At STP, 1 mole of gas has a molar volume of 22.4 L. What is the density of oxygen at STP?

Accepted Answer

The answer of At STP, 1 mole of gas has...

Question 6

What volume of CO2 gas at 645 torr and 800 K could be produced by the reaction of 45 g of CaCO3 according to the equation?
 CaCO3(s)$\rarr$CaO(s)+ CO2(g)

Accepted Answer

A) 0.449 L 
B) 22.4 L 
C) 25.0 L 
D) 34.8 L 
E) 45.7 mL 
A) 0.449 L 
B) 22.4 L 
C) 25.0 L 
D) 34.8 L 
E) 45.7 mL

Question 7

A convenient way to produce very high purity oxygen in the laboratory is to decompose KMnO4(s)at high temperature according to the following chemical equation:
2KMnO4(s)$\rarr$K2MnO4(s)+ MnO2(s)+ O2(g)
If 2.50 L of O2(g)is needed at 1.00 atm and 20°C, what mass of KMnO4(s)should be decomposed? Assume the decomposition of KMnO4(s)goes to completion.

Accepted Answer

The answer of A convenient way to produce very high...

Question 8

A sample of hydrogen gas was collected over water at 21°C and 685 mmHg. The volume of the container was 7.80 L. Calculate the mass of H2(g)collected. (Vapor pressure of water = 18.6 mmHg at 21°C.)

Accepted Answer

A) 0.283 g 
B) 0.572 g 
C) 0.589 g 
D) 7.14 g 
E) 435 g 
A) 0.283 g 
B) 0.572 g 
C) 0.589 g 
D) 7.14 g 
E) 435 g

Question 9

Gas A and gas B are combined in a flask at initial pressures of 1.0 atm each. The flask is sealed and over time they react to completion to give gas C according to the following chemical equation: 2A(g)+ B(g)$\rarr$ C(g)
Assuming the temperature stays constant, what will be the total pressure in the flask after the reaction goes to completion?

Accepted Answer

A) 0.33 atm 
B) 0.50 atm 
C) 0.67 atm 
D) 0.75 atm 
E) 1.0 atm 
A) 0.33 atm 
B) 0.50 atm 
C) 0.67 atm 
D) 0.75 atm 
E) 1.0 atm

In a weather forecast on a Seattle radio station the barometric pressure was reported to be 29.4 inches. What is this pressure in SI units? (1 inch = 25.4 mm, 1 atm = 760 mmHg)

Which of these gas molecules have the highest average kinetic energy at 25°C?

A spacecraft is filled with 0.500 atm of N₂ and 0.500 atm of O₂. Suppose a micrometeor strikes this spacecraft and puts a very small hole in it's side. Under these circumstances,

If 30.0 L of oxygen are cooled from 200ºC to 1°C at constant pressure, what is the new volume of oxygen?

At STP, 1 mole of gas has a molar volume of 22.4 L. What is the density of oxygen at STP?

What volume of CO₂ gas at 645 torr and 800 K could be produced by the reaction of 45 g of CaCO₃ according to the equation? CaCO₃(s) $\rarr$ CaO(s)+ CO₂(g)

A sample of hydrogen gas was collected over water at 21°C and 685 mmHg. The volume of the container was 7.80 L. Calculate the mass of H₂(g)collected. (Vapor pressure of water = 18.6 mmHg at 21°C.)

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Exam 5: Gases

In a weather forecast on a Seattle radio station the barometric pressure was reported to be 29.4 inches. What is this pressure in SI units? (1 inch = 25.4 mm, 1 atm = 760 mmHg)

Which of these gas molecules have the highest average kinetic energy at 25°C?

A spacecraft is filled with 0.500 atm of N2 and 0.500 atm of O2. Suppose a micrometeor strikes this spacecraft and puts a very small hole in it's side. Under these circumstances,

If 30.0 L of oxygen are cooled from 200ºC to 1°C at constant pressure, what is the new volume of oxygen?

At STP, 1 mole of gas has a molar volume of 22.4 L. What is the density of oxygen at STP?

What volume of CO2 gas at 645 torr and 800 K could be produced by the reaction of 45 g of CaCO3 according to the equation? CaCO3(s) →\rarr→ CaO(s)+ CO2(g)

A sample of hydrogen gas was collected over water at 21°C and 685 mmHg. The volume of the container was 7.80 L. Calculate the mass of H2(g)collected. (Vapor pressure of water = 18.6 mmHg at 21°C.)

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Reactions in Aqueous Solution

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

A spacecraft is filled with 0.500 atm of N₂ and 0.500 atm of O₂. Suppose a micrometeor strikes this spacecraft and puts a very small hole in it's side. Under these circumstances,

What volume of CO₂ gas at 645 torr and 800 K could be produced by the reaction of 45 g of CaCO₃ according to the equation? CaCO₃(s) $\rarr$ CaO(s)+ CO₂(g)

A sample of hydrogen gas was collected over water at 21°C and 685 mmHg. The volume of the container was 7.80 L. Calculate the mass of H₂(g)collected. (Vapor pressure of water = 18.6 mmHg at 21°C.)