One process used to manufacture sulfuric acid is called the contact process ... determine the amount of energy released when 1.00 mole of sulfur trioxide is produced

From the reaction;

2SO2 (g) + O2 (g) = 2SO3 (g) + 394 kJ

In the reaction a mixture of plantinum and vanadium (V) oxide may be used as a catalyst for the reaction. The sulfur trioxide produced is then used to make sulfuric acid.

The energy that is required to release 1 mole of sulfur trioxide is + 394 joules

For one mole of sulfur trioxide;

the energy that will be released will be 394/2 = 197 kJ

Thus; the amount of energy released is + 197 kJ