Question 1

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

Question 2

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

Question 3

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

Question 4

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

Question 5

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

Question 6

Given the data in the table below, ΔH°rxn for the reaction 4NH3 (g) + 5 O2 (g) → 4NO (g) + 6 H2O (l) 
Is __________ kJ. rxn for the reaction 4NH3 (g) + 5 O2 (g) → 4NO (g) + 6 H2O (l)  Is __________ kJ.   A) -1172 B) -150 C) -1540 D) -1892 E) The ΔHf ° of O2 (g) is needed for the calculation." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

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

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 × 2. H2 (g) + Cl2 (g) → 2HCl (g)  
A)  66 
B)  5.3 ×   
C)  33 
D)  47 
E)  -186" class="answers-bank-image d-inline" rel="preload" >
C)  33
D)  47
E)  -186

Question 8

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...

Exam 5: Thermochemistry

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

Correct Answer
verified

Correct Answer
verified

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?

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified

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)

Correct Answer
verified

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)

Correct Answer
verified

Exam 5: Thermochemistry

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

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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)

Correct Answer
verified

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)

Correct Answer
verified