12.     Predict the direction of the equilibrium shift when temperature isdecreased in the following reactions:
a.        C2H2 (g) + H2O (g) ?CH3CHO (g)      [?H = -151kJ/mol]
b.        CH3CH2OH (l) + O2 (g) ?CH3CH2O (g) + H2O(g)      [?H = exothermic]
c.        2CH3CHO (g) ? 2 C2H4 (g) +O2 (g)      [?H =endothermic]
13.           Consider the following endothermic reaction for the production ofhydrogen gas in a rigid container:
CH4(g) + H2O(g)? CO(g) + 3 H2(g)
How will the yield of hydrogen changeif the equilibrium is disturbed by:
a.        Adding acatalyst.
b.        Increasing thepressure.
c.        Decreasing thetemperature.
d.        Adding inertargon gas.
e.        Increasing thetemperature.
