Chapter 12, Problem 60QAP

Interpretation Introduction

Interpretation:

The change in enthalpy for the reaction needs to be determined.

Concept introduction:

For a general equilibrium reaction as follows:

$\text{A}\left(g\right)+\text{B}\left(g\right)\rightleftharpoons \text{C}\left(g\right)+\text{D}\left(g\right)$

The expression for the equilibrium constant is represented as follows:

$K=\frac{\left(P_C\right)\left(P_D\right)}{\left(P_A\right)\left(P_B\right)}$

Here, to calculate the equilibrium constant, the values of partial pressure of all the species in reactant and product side are required.

The equilibrium constant of a reaction depends on the temperature. The relation is given by Van’t Hoff equation which is as follows:

$\ln \left(\frac{K_2}{K_1}\right)=\frac{\Delta H}{R}\left(\frac{1}{T_1}-\frac{1}{T_2}\right)$

Here, K is equilibrium constant, R is Universal gas constant, T is temperature and $\Delta H$ is change in enthalpy.