What is the formation enthalpy of acetylene? If the combustion enthalpies of carbon, hydrogen and acetylene are \( -394 \text{ kJ} \) , \( -286 \text{ kJ} \) and \( -1304 \text{ kJ} \) , respectively.

A \( -462 \text{ kJ/mol} \)

B \( 231 \text{ kJ/mol} \)

C \( -462 \text{ kJ/mol} \)