Acetylene, C2H2, is used in welding torches. It releases a lot of energy when burned in oxygen. The combustion of one gram of acetylene releases 48. 2 kJ. A 0. 750-gram sample of acetylene is burned in a bomb calorimeter (heat capacity = 1. 117kJ/°C) that contains 800. 0 g of water. The final temperature of the bomb and water after combustion is 35. 2°C. What is the initial temperature of the bomb and water?.