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Solution: The enthalpy of combustion of acetylene C 2H2 is described byC2H2 (g) + (5/2)O2 (g) ⇌ CO2 (g) + H2O (l)   Heat of Reaction (Rxn) = -1299kJ/molCalculate the enthalpy of formation of accetylene, given the following enthalpies of formation:Standard formation [CO2 (g)] = -393.5 kJ/molStandard formation [H2O (l)] = -285.8 kj/mol

Problem

The enthalpy of combustion of acetylene C 2H2 is described by

C2H2 (g) + (5/2)O2 (g) ⇌ CO2 (g) + H2O (l)   Heat of Reaction (Rxn) = -1299kJ/mol

Calculate the enthalpy of formation of accetylene, given the following enthalpies of formation:

Standard formation [CO2 (g)] = -393.5 kJ/mol

Standard formation [H2O (l)] = -285.8 kj/mol