Question
Calculate the enthalpy of combustion of methane, it is given that heat of formation of CO2(g), H2O(l) and CH4(g) are -393 5 kJ mol–1, –285 .9 kJ mol–1 and –748 kJ mol–1 respectively.
Solution
We have the equation,
Given that:
Multiplying equation (ii) by 2, we have,
Adding equations (i) and (iv), we have,
Subtracting equation (iii) from equation (v), we have,
Enthalpy of combustion of methane is -217.3 kJ mol-1.
