Chapter 14, Problem 14.30P

Species $N_2{O}_4$ and NO₂ as gases come to equilibrium by the reaction: $N_2{O}_4\to 2N{O}_2$ .

1. For T = 350 K and P = 5 bar. calculate the mole fractions of these species in the equilibrium mixture. Assume ideal gases.
2. If an equilibrium mixture of $N_2{O}_4$ and $N{O}_2$ at conditions of part (a) flows through a throttle valve to a pressure of 1 bar and through a heat exchanger that restores its initial temperature, how much heat is exchanged, assuming chemical equilibrium is again attained in the final state? Base the answer on an amount of mixture equivalent to 1 mol of $N_2{O}_4$ , i.e.. as though the NO₂ were present as $N_2{O}_4$ .