The Heat of Combustion Per Mole for Acetylene,C₂H₂(g),is -1299

The heat of combustion per mole for acetylene,C₂H₂(g) ,is -1299.5 kJ/mol.Assuming that the combustion products are CO₂(g) and H₂O(l) ,and given that the enthalpy of formation is -393.5 kJ/mol for CO₂(g) and -285.8 kJ/mol for H₂O(l) ,find the enthalpy of formation of C₂H₂(g) .

A) -846.1 kJ/mol
B) -620.2 kJ/mol
C) -226.7 kJ/mol
D) +226.7 kJ/mol