Question 1

A 22.44 g sample of iron absorbs 180.8 J of heat, upon which the temperature of the sample increases from 21.1 °C to 39.0 °C. What is the specific heat of iron?

Accepted Answer

A) 0.140 
B) 0.450 
C) 0.820 
D) 0.840 
E) 0.900 
A) 0.140 
B) 0.450 
C) 0.820 
D) 0.840 
E) 0.900

Question 2

The value of ΔH° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is __________ kJ. 2S (s)+ 3O2 (g)→ 2SO3 (g)

Accepted Answer

A) 23 
B) -23 
C) -12 
D) 12 
E) -790 
A) 23 
B) -23 
C) -12 
D) 12 
E) -790

Question 3

The value of ΔE for a system that performs 111 kJ of work on its surroundings and gains 89 kJ of heat is __________ kJ.

Accepted Answer

A) -111 
B) -200 
C) 200 
D) -22 
E) 22 
A) -111 
B) -200 
C) 200 
D) -22 
E) 22

Question 4

Given the data in the table below, ΔH°rxn for the reaction 4NH3 (g)+ 5 O2 (g)→ 4NO (g)+ 6 H2O (l)
Is __________ kJ.

Accepted Answer

A) -1172 
B) -150 
C) -1540 
D) -1892 
E) The ΔHf ° of O2 (g)is needed for the calculation. 
A) -1172 
B) -150 
C) -1540 
D) -1892 
E) The ΔHf ° of O2 (g)is needed for the calculation.

Question 5

Under what condition(s)is the enthalpy change of a process equal to the amount of heat transferred into or out of the system? (a)temperature is constant
(b)pressure is constant
(c)volume is constant

Accepted Answer

A) a only 
B) b only 
C) c only 
D) a and b 
E) b and c 
A) a only 
B) b only 
C) c only 
D) a and b 
E) b and c

Question 6

The standard enthalpy change of a reaction is the enthalpy change when all reactants and products are at ________ pressure and a specific temperature.

Accepted Answer

The answer of The standard enthalpy change of a reaction...

Question 7

The value of ΔH° for the reaction below is -186 kJ. Calculate the heat (kJ)released from the reaction of 25 g of Cl2. H2 (g)+ Cl2 (g)→ 2HCl (g)

Accepted Answer

A) 66 
B) 5.3 ×   
C) 33 
D) 47 
E) -186 
A) 66 
B) 5.3 ×   
C) 33 
D) 47 
E) -186

Question 8

The combustion of titanium with oxygen produces titanium dioxide: Ti (s)+ O2 (g)→ TiO2 (s)
When 2.060 g of titanium is combusted in a bomb calorimeter, the temperature of the calorimeter increases from 25.00 °C to 91.60 °C. In a separate experiment, the heat capacity of the calorimeter is measured to be 9.84 kJ/K. The heat of reaction for the combustion of a mole of Ti in this calorimeter is __________ kJ/mol.

Accepted Answer

A) 14.3 
B) 19.6 
C) -311 
D) -0.154 
E) -1.52 × 104 
A) 14.3 
B) 19.6 
C) -311 
D) -0.154 
E) -1.52 × 104

A 22.44 g sample of iron absorbs 180.8 J of heat, upon which the temperature of the sample increases from 21.1 °C to 39.0 °C. What is the specific heat of iron?

The value of ΔH° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is __________ kJ. 2S (s)+ 3O₂ (g)→ 2SO₃ (g)

The value of ΔE for a system that performs 111 kJ of work on its surroundings and gains 89 kJ of heat is __________ kJ.

Given the data in the table below, ΔH°_rxn for the reaction 4NH₃ (g)+ 5 O₂ (g)→ 4NO (g)+ 6 H₂O (l) Is __________ kJ.

Under what condition(s)is the enthalpy change of a process equal to the amount of heat transferred into or out of the system? (a)temperature is constant (b)pressure is constant (c)volume is constant

The standard enthalpy change of a reaction is the enthalpy change when all reactants and products are at ________ pressure and a specific temperature.

The value of ΔH° for the reaction below is -186 kJ. Calculate the heat (kJ)released from the reaction of 25 g of Cl₂. H₂ (g)+ Cl₂ (g)→ 2HCl (g)

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

Exam 5: Thermochemistry

A 22.44 g sample of iron absorbs 180.8 J of heat, upon which the temperature of the sample increases from 21.1 °C to 39.0 °C. What is the specific heat of iron?

The value of ΔH° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is __________ kJ. 2S (s)+ 3O2 (g)→ 2SO3 (g)

The value of ΔE for a system that performs 111 kJ of work on its surroundings and gains 89 kJ of heat is __________ kJ.

Given the data in the table below, ΔH°rxn for the reaction 4NH3 (g)+ 5 O2 (g)→ 4NO (g)+ 6 H2O (l) Is __________ kJ.

Under what condition(s)is the enthalpy change of a process equal to the amount of heat transferred into or out of the system? (a)temperature is constant (b)pressure is constant (c)volume is constant

The standard enthalpy change of a reaction is the enthalpy change when all reactants and products are at ________ pressure and a specific temperature.

The value of ΔH° for the reaction below is -186 kJ. Calculate the heat (kJ)released from the reaction of 25 g of Cl2. H2 (g)+ Cl2 (g)→ 2HCl (g)

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

The value of ΔH° for the reaction below is -790 kJ. The enthalpy change accompanying the reaction of 0.95 g of S is __________ kJ. 2S (s)+ 3O₂ (g)→ 2SO₃ (g)

Given the data in the table below, ΔH°_rxn for the reaction 4NH₃ (g)+ 5 O₂ (g)→ 4NO (g)+ 6 H₂O (l) Is __________ kJ.

The value of ΔH° for the reaction below is -186 kJ. Calculate the heat (kJ)released from the reaction of 25 g of Cl₂. H₂ (g)+ Cl₂ (g)→ 2HCl (g)