Q.The standard enthalpy of formation of $CO_2(g)$ , $H_2O(l)$ and $CH_4(g)$ are $-393.5, -285.8$ and $-74.8 \text{ kJ/mol}$ . The enthalpy of combustion of methane is:

-890.3 \text{ kJ/mol}

-604.5 \text{ kJ/mol}

+890.3 \text{ kJ/mol}

-754.1 \text{ kJ/mol}

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Q.The standard enthalpy of formation of CO2(g)CO_2(g)CO2​(g), H2O(l)H_2O(l)H2​O(l) and CH4(g)CH_4(g)CH4​(g) are −393.5,−285.8-393.5, -285.8−393.5,−285.8 and −74.8 kJ/mol-74.8 \text{ kJ/mol}−74.8 kJ/mol. The enthalpy of combustion of methane is: