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7. Oxyacetylene torches produce such high temperatures that they are often used to weld and cut metal. When 2.50 g of acetylene (C2H2) is burned in a bomb calorimeter, with a heat capacity of 10.85 kJ/K, the temperature increases from 23.488 oC to 34.988 oC. What is the internal energy (ΔErxn) of this combustion reaction?