?Species \(\mathrm{N}_{2} \mathrm{O}_{4} \text { and } \mathrm{NO}_{2}\) as gases come

Chapter 14, Problem 14.30

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Species \(\mathrm{N}_{2} \mathrm{O}_{4} \text { and } \mathrm{NO}_{2}\) as gases come to equilibrium by the reaction: \(\mathrm{N}_{2} \mathrm{O}_{4} \rightarrow 2 \mathrm{NO}_{2}\).

(a) For T = 350 K and P = 5 bar, calculate the mole fractions of these species in the equilibrium mixture. Assume ideal gases.

(b) If an equilibrium mixture of \(\mathrm{N}_{2} \mathrm{O}_{4} \text { and } \mathrm{NO}_{2}\) 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 \(\mathrm{N}_{2} \mathrm{O}_{4}\), i.e., as though the \(\mathrm{NO}_{2}\) were present as \(\mathrm{N}_{2} \mathrm{O}_{4}\).

Text Transcription:

N_2O_4 and NO_2

N_2O_4 rightarrow 2NO_2

N_2O_4

NO_2