Complete combustion of 1 mol of methane (CH4) liberates -887 kJ/mol:

CH4(g) + 2O2 → CO2(g) + 2H2O


Using this information together with the standard enthalpies of formation given below, calculate the standard enthalpy of formation of water.
CH4(g) = −75 kJ/mol
O2 = 0 kJ/mol
CO2(g) = -393.5 kJ/mol
Responses
A -568 kJ/mol-568 kJ/mol
B -284 kJ/mol-284 kJ/mol
C 150 kJ/mol150 kJ/mol
D 418 kJ/mol