Chapter 14, Problem 14.60QP

In the uncatalyzed reaction

${\text{N}}_2{\text{O}}_4(g)\rightleftharpoons 2{\text{NO}}_2(g)$

the pressure of the gases at equilibrium are $P_{{\text{N}}_2{\text{O}}_4}=0.377$ and $P_{{\text{NO}}_2}=1.56$ atm at 100°C. What would happen to these pressures if a catalyst were added to the mixture?