Methanol Can Be Synthesized by Combining Carbon Monoxide and Hydrogen

Multiple Choice

Methanol can be synthesized by combining carbon monoxide and hydrogen. CO(g) + 2H₂(g) ⇄ CH₃OH(g) ΔH°_rxn = −90.7 kJ
A reaction vessel contains these compounds at equilibrium. What effect will be seen when equilibrium is re-established after decreasing the temperature by 45°C?

A) All the partial pressures will decrease.
B) The partial pressure of methanol will decrease.
C) The partial pressures of hydrogen and methanol will decrease.
D) The partial pressure of hydrogen will increase.
E) The partial pressure of carbon monoxide will decrease.