Chapter 13, Problem 95E

Consider the equilibrium

$4{\text{NO}}_2\left(g\right)+6{\text{H}}_2\text{O}\left(g\right)\rightleftharpoons 4{\text{NH}}_3\left(g\right)+7{\text{O}}_2\left(g\right)$

(a) What is the expression for the equilibrium constant (K_c) of the reaction?

(b) How must the concentration of NH₃ change to reach equilibrium if the reaction quotient is less than the equilibrium constant?

(c) If the reaction were at equilibrium, how would a decrease in pressure (from an increase in the volume of the reaction vessel) affect the pressure of NO₂?

(d) If the change in the pressure of NO₂ is 28 torr as a mixture 0f the four gases reaches equilibrium, how much will the pressure of O₂ change?