question_answer

A mixture of \[N{{H}_{3}}\,(g)\] and \[{{N}_{2}}{{H}_{4}}(g)\] is placed in a sealed container at 300 K. The total pressure is 0.5 atm. The container is heated to 1200 K at which both substances decompose completely according to the equations \[2N{{H}_{3}}(g)\to {{N}_{2}}(g)+3{{H}_{2}}(g)\] and      \[{{N}_{2}}{{H}_{4}}(g)\to {{N}_{2}}(g)+2{{H}_{2}}(g)\] After decomposition is complete, the total pressure at 1200 K is found to be 4.5 atm. Find the mole % of \[{{N}_{2}}{{H}_{4}}\] in the original mixture.

Answer:

25