   # Given the following data calculate ∆H for the reaction On the basis of the enthalpy change, is this a useful reaction for the synthesis of ammonia? ### 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 69E
Textbook Problem
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## Given the following data calculate ∆H for the reaction On the basis of the enthalpy change, is this a useful reaction for the synthesis of ammonia?

Interpretation Introduction

Interpretation: The enthalpy change ΔH of given reaction has to be calculated and the feasibility of ammonia synthesis should be discussed.

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 (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:

Enthalpy of ammonia decomposition is 92KJ

Enthalpy of water formation is -484 KJ

2N2(g)+6H2(g)4NH3(g)ΔH=2(92KJ)......(1)6H2O(g)6H2(g)+3O2(g)ΔH=3(484KJ)......(2)                                  ΔH=ΔH1+ΔH2

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