KEAM 2018 Physics and Chemistry Paper

The related equation for the formation of ethanol is.
When 2 moles of graphite is involved the standard enthalpy of reaction is −277.7kJ/mol
∴ When 4 moles of graphite is involved, standard enthalpy of reaction is 2×(−277.7kJ/mol)
=(−)555.4kJ/‌mol