Consider the reaction: H _2( g )+ I _2( g ) 2 HI ( g ) The equilibrium concentrations…

CHEMISTRY · Multi-part · CBSE · Chemistry · Equilibrium · Equilibrium

Problem

Consider the reaction:

\text{H}_2(\text{g})+\text{I}_2(\text{g})\rightleftharpoons2\text{HI}(\text{g})

The equilibrium concentrations of hydrogen, iodine, and hydrogen iodide at

760\,\text{K}

are

0.012

0.015

, and

0.091\,\text{mol dm}^{-3}

, respectively. (1) Deduce the equilibrium constant expression and determine the

K

value for this reaction at

760\,\text{K}

. (2) The

K

value for the same reaction at

715\,\text{K}

48.0

. Deduce the sign of the standard enthalpy change for the forward reaction.