A key step in the production of sulfuric acid is the oxidation

of SO2(g) to SO(g):

2SO2(g) + O2(g)-2SO (9) At 298 K, AG=-141.6 kJ; AH-198.4 KJ; and AS-187.9 J/K (a) Use the data to decide if this reaction is spontaneous at 25 C, and

predict how AG will change with increasing T. (b) Assuming AH and AS are constant with increasing T (no phase change occurs), is the reaction spontaneous at 900. C?