Chapter 6, Problem 6.78P

Consider the following reaction.

${\text{H}}_{\text{2}}\left(g\right)+{\text{I}}_2\left(g\right)\rightleftarrows 2\text{HI}\left(g\right)$

1. Write the expression for the equilibrium constant.
2. Calculate K using the following concentrations of each substance at equilibrium:

3. $\left[{\text{H}}_{\text{2}}\right]=0.\text{9}5\text{ M};\left[{\text{I}}_{\text{2}}\right]=0.\text{78 M};\left[\text{HI}\right]=0.\text{27 M}$.