Chemistry for Engineering Students
Chemistry for Engineering Students
4th Edition
ISBN: 9781337398909
Author: Lawrence S. Brown, Tom Holme
Publisher: Cengage Learning
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Textbook Question
Chapter 9, Problem 9.56PAE

9.56 Using heats of formation tabulated in Appendix E, calculate the heats of reaction for the following.

(a) C 2 H 2 ( g ) + 5 2 O 2 ( g ) 2CO 2 ( g ) + H 2 O ( l )

(b) PCl 3 ( g ) + Cl 2 ( g ) PCl 5 ( g )

(c) C 2 H 4 ( g ) + H 2 O ( g ) C 2 H 5 OH ( g )

(d) Fe 2 O 3 ( s ) + 2Al ( s ) Al 2 O 3 ( s ) + 2Fe ( l )

a.

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

The heat of reaction from the heat of formation should be calculated.

Concept Introduction:

The heat of formation is the change in enthalpy when one mole of a substance formed at constant condition (temperature and pressure).

The heat of reaction is the change in enthalpy at constant pressure.

Hess’s law: states change in enthalpy of all the changes occurred in the reaction.

ΔH=ΔHf Product ΔHf Reactant

Answer to Problem 9.56PAE

Solution: The heat of reaction is 1297.83 kJ/mole.

Explanation of Solution

ΔH=ΔHf Product ΔHf Reactant

ΔH =[-786 – 285.83][226] = -1297.83kJ/mol

b.

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

The heat of reaction from the heat of formation should be calculated.

Concept Introduction:

The heat of formation is the change in enthalpy when one mole of a substance formed at constant condition (temperature and pressure).

The heat of reaction is the change in enthalpy at constant pressure.

Hess’s law: states change in enthalpy of all the changes occurred in the reaction.

ΔH=ΔHf Product ΔHf Reactant

Answer to Problem 9.56PAE

Solution: The heat of reaction is -119.8 kJ/mole.

Explanation of Solution

ΔH=ΔHf Product ΔHf Reactant

ΔH= ΔHPCl5[ΔHPCl3+ΔHCl2]

ΔH= -151.8  - [-32.8 +0]    = -151.8 +32 = -119.8 kJ/mol

c.

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

The heat of reaction from the heat of formation should be calculated.

Concept Introduction:

The heat of formation is the change in enthalpy when one mole of a substance formed at constant condition (temperature and pressure).

The heat of reaction is the change in enthalpy at constant pressure.

Hess’s law: states change in enthalpy of all the changes occurred in the reaction.

ΔH=ΔHf Product ΔHf Reactant

Answer to Problem 9.56PAE

Solution: The heat of reaction is 466 kJ/mole.

Explanation of Solution

ΔH=ΔHf Product ΔHf Reactant

ΔH= [ΔHC2H4+ΔHH2O]ΔHC2H5OH

ΔH = 277 – [52+ (-241)] = 466 kJ/mol

d.

Expert Solution
Check Mark
Interpretation Introduction

Interpretation:

The heat of reaction from the heat of formation should be calculated.

Concept Introduction:

The heat of formation is the change in enthalpy when one mole of a substance formed at constant condition (temperature and pressure).

The heat of reaction is the change in enthalpy at constant pressure.

Hess’s law: states change in enthalpy of all the changes occurred in the reaction.

ΔH=ΔHf Product ΔHf Reactant

Answer to Problem 9.56PAE

Solution: The heat of reaction is -852 kJ/mole.

Explanation of Solution

ΔH=ΔHf Product ΔHf Reactant

ΔH = -1676 -[-824] = -852 kJ/mole

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Chapter 9 Solutions

Chemistry for Engineering Students

Ch. 9 - Prob. 9.3PAECh. 9 - Prob. 9.4PAECh. 9 - Prob. 9.5PAECh. 9 - Prob. 9.6PAECh. 9 - Define the term internal energy.Ch. 9 - How fast (in meters per second) must an iron ball...Ch. 9 - What is the kinetic energy of a single molecule of...Ch. 9 - 9.10 The kinetic energy of molecules is often used...Ch. 9 - 9.11 Analyze the units of the quantity...Ch. 9 - 9.12 How many kilojoules are equal to 3.27 L atm...Ch. 9 - Prob. 9.13PAECh. 9 - Prob. 9.14PAECh. 9 - 9.15 Carry out the following conversions of energy...Ch. 9 - 9.16 According to Figure 9.2, the total energy...Ch. 9 - 9.17 If a machine does 4.8103kJ of work after an...Ch. 9 - 9.18 Calculate (a) q when a system does 54J of...Ch. 9 - 9.19 If the algebraic sign of E is negative, in...Ch. 9 - 9.20 State the first law of thermodynamics briefly...Ch. 9 - 9.21 Which type of energy heat or work, is valued...Ch. 9 - 9.12 PV-work occurs when volume changes and...Ch. 9 - 9.23 Which system does not work: (a) E=436J ,...Ch. 9 - 9.29 In which case is heat added to the system:...Ch. 9 - Prob. 9.25PAECh. 9 - 9.26 Gas furnaces have achieved impressive...Ch. 9 - Prob. 9.27PAECh. 9 - 9.28 When an electrical appliance whose power...Ch. 9 - Prob. 9.29PAECh. 9 - 9.30 For the example of shallow water and sandy...Ch. 9 - 9.31 A metal radiator is made from 26.0 kg of...Ch. 9 - 9.32 The material typically used to heat metal...Ch. 9 - 9.33 Copper wires used to transport electrical...Ch. 9 - 9.34 A copper nail and an iron nail of the same...Ch. 9 - 9.35 A piece of titanium metal with a mass of 20.8...Ch. 9 - 9.36 Define the term calibration.Ch. 9 - 9.37 A calorimeter contained 75.0 g of water at...Ch. 9 - 9.38 The energy densities of various types of coal...Ch. 9 - 9.39 How much thermal energy is required to heat...Ch. 9 - Prob. 9.40PAECh. 9 - 9.41 Under what conditions does the enthalpy...Ch. 9 - 9.42 Why is enthalpy generally more useful than...Ch. 9 - Prob. 9.43PAECh. 9 - Prob. 9.44PAECh. 9 - 9.45 What happens to the temperature of a material...Ch. 9 - 9.46 The heat of fusion of pure silicon is 43.4...Ch. 9 - 9.47 If 14.8 kJ of heat is given off when 1.6 g of...Ch. 9 - 9.48 Calculate the energy required to convert 1.70...Ch. 9 - 9.49 Hvap=31.3 kJ/mol for acetone. 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