Chapter 6, Problem 75AE

An initial mixture of nitrogen gas and hydrogen gas isreacted in a rigid container at a certain temperature asfollows:

${\text{3H}}_{\text{2}}\text{(}g{\text{)+N}}_{\text{2}}\text{(}g\text{)}\rightleftharpoons {\text{2NH}}_{\text{3}}\text{(}g\text{)}$

At equilibrium, the concentrations are $[H_2]=5.0M,[N_2]=8.0M,\text{ and }[N{H}_3]=4.0M$ . What were the concentrationsof nitrogen gas and hydrogen gas that werereacted initially?