Chemistry: An Atoms-Focused Approach
Chemistry: An Atoms-Focused Approach
14th Edition
ISBN: 9780393912340
Author: Thomas R. Gilbert, Rein V. Kirss, Natalie Foster
Publisher: W. W. Norton & Company
Question
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Chapter 19, Problem 19.56QA
Interpretation Introduction

To calculate:

a) Hrxn for the production of acetylene from the reaction between calcium carbide and water.

b) Is the given reaction endothermic or an exothermic?

Expert Solution & Answer
Check Mark

Answer to Problem 19.56QA

Solution:

a) Hrxn for the production of acetylene from the reaction between calcium carbide and water is  -127.1 kJ.

b) The reaction is exothermic.

Explanation of Solution

1) Concept:

We can calculate the Hrxn from the difference between the standard molar enthalpies of reactants and products.

2) Formula:

Hrxn=nproducts×Hf,products0-nreactants×Hf,reactants0

“n” is the coefficient of the products and reactants.

3) Given:

The given reaction is

CaC2s+2H2O lC2H2g+CaOH2(s)

From appendix 4, the value of Hf0 are

Hf0(kJ/mol)
CaC2s -59.8
H2O l -285.8
C2H2g 226.7
CaOH2(s) -985.2

4) Calculation:

a) Calculation for Hrxn0:

Hrxn=nproducts×Hf,products0-nreactants×Hf,reactants0

Hrxn=1 mol×Hf,C2H2g0+1 mol×Hf,CaOH2(s)0-1 mol×Hf,CaC2s0+2 mol×Hf,H2O l0

Hrxn=1 mol×226.7kJmol+1 mol×-985.2kJmol-1 mol×-59.8kJmol+2 mol×-285.8kJmol

Hrxn=-758.5-(-631.4)

Hrxn=-127.1 kJ

Hrxn for the production of acetylene from the reaction between calcium carbide and water is -127.1 kJ.

b) The sign of calculated value Hrxn is negative. This indicates that the reaction is exothermic.

Conclusion:

Based on the values of Hf0, the value of Hrxn for the production of acetylene from the reaction between calcium carbide and water is calculated, and the reaction is exothermic.

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Chapter 19 Solutions

Chemistry: An Atoms-Focused Approach

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