   # At 298 K, the standard enthalpies of formation for C 2 H 2 ( g ) and C 6 H 6 (l) are 227 kJ/mol and 49 kJ/mol, respectively. a. Calculate ∆ H° for C 6 H 6 ( l ) → 3 C 2 H 2 ( g ) b. Both acetylene (C 2 H 2 ) and benzene (C 6 H 6 ) can be used as fuels. Which compound would liberate more energy per gram when combusted in air? ### 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 107AE
Textbook Problem
16 views

## At 298 K, the standard enthalpies of formation for C2H2(g) and C6H6(l) are 227 kJ/mol and 49 kJ/mol, respectively.a. Calculate ∆H° for C 6 H 6 ( l ) → 3 C 2 H 2 ( g ) b. Both acetylene (C2H2) and benzene (C6H6) can be used as fuels. Which compound would liberate more energy per gram when combusted in air?

a)

Interpretation Introduction

Interpretation: For given reaction, standard enthalpy change and which compound would release more energy per gram when combustion in air has to be calculated.

Concept introduction

Standard Enthalpy change (ΔH0): The heat change when molar quantities of reactants as specified by chemical equation to form a product at standard conditions.

Standard conditions are: 250C and 1 atmosphere pressure.

### Explanation of Solution

The standard enthalpy of formation of acetylene is 229kJ/ mol and benzene is 46kJ / mol at room temperature.

Calculate standard enthalpy change for given equation.

ΔH0= H0product-Hreactant0

=(3×227 kJ/mol)-(1×49 kJ/mol

b)

Interpretation Introduction

Interpretation: For given reaction, standard enthalpy change and which compound would release more energy per gram when combustion in air has to be calculated.

Concept introduction

Standard Enthalpy change (ΔH0): The heat change when molar quantities of reactants as specified by chemical equation to form a product at standard conditions.

Standard conditions are: 250C and 1 atmosphere pressure.

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