Question

The enthalpy of combustion of methane, graphite and dihydrogen at 298 K are, -890.3 kJ mol^-1, -393.5 kJ mol^-1 and -285.8 kJ mol^-1 respectively. Enthalpy of formation of CH_4(g) will be :

(a) – 74.8 kJ mol^-1

(b) – 52.27 kJ mol^-1

(c) + 74.8 kJ mol^-1

(d) + 52.26 kJ mol^-1

Answer 1

Option : (a) – 74.8 kJ mol^-1