   # Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C 4 H 4 ( −2341 kJ/mol), C 4 H 8 (−2755 kJ/mol), and H 2 (−286 kJ/mol), calculate ∆H for the reaction C 4 H 4 ( g ) + 2 H 2 ( g ) → C 4 H 8 ( g ) ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 7, Problem 68E
Textbook Problem
552 views

## Combustion reactions involve reacting a substance with oxygen. When compounds containing carbon and hydrogen are combusted, carbon dioxide and water are the products. Using the enthalpies of combustion for C4H4 ( −2341 kJ/mol), C4H8 (−2755 kJ/mol), and H2 (−286 kJ/mol), calculate ∆H for the reaction C 4 H 4 ( g )   +   2 H 2 ( g )   →   C 4 H 8 ( g )

Interpretation Introduction

Interpretation: The enthalpy change ΔH of given reaction has to be calculated.

Concept Introduction:

Hess's Law:

• The changing enthalpy of a chemical is self-determining of the route by which the chemical reaction occurs.
• The enthalpy change of the reaction is equal to in which reaction is occurs whether it is in one or multiple steps.

Formula:

ΔH(total)ΔH (number of steps)......(1)

Rules:

• The sign of ΔH reversed when the reaction is reversed.
• The quantities of reactants and products is directly proportional to the magnitude of ΔH in a reaction. If the coefficients in a balanced reaction are multiplied by an integer, the value of ΔH is multiplied by the same integer.

### Explanation of Solution

Explanation

To calculate: The enthalpy change ΔH

Given:

Combustion enthalpy of C4H4 is - 2341 kJ/mol

Combustion enthalpy of C4H8 is - 2755 kJ/mol

Combustion enthalpy of H2 is -286 kJ/mol

C4H4+5O2(g)4CO2+2H2O(l)ΔH=-2341kJ......(1)4CO(g)+4H2O(l)C4H8(g)+6O2(g)               ΔH=-(-2755KJ)......(2)2H2(g)+O2(g)2H2O(l)ΔH=2(-286KJ)

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