Chemistry help?

Question

Given the reaction at equilibrium :
N2(g) + 3 H2(g) ↔ 2 NH3(g) + 92.05 kJ


a. State the effect on the number of moles of N2(g) if the temp of the system is increased
b. State the effect on the number of moles of H2(g) if the pressure on the system is increased.
c. State the effect on the number of moles of NH3(g) if a catalyst is introduced into the reaction system. Explain why this occurs

Answer 1

a. Moles N2 decrease, because amount of added heat shifts equilibrium according to Le Chatelier's principle.

b. Moles H2 decrease, because reaction shifts toward fewer molecules and so lesser pressure in accord with above.

c. Catalyst has no effect on number of moles.