Question
Calculate the enthalpy of formation of acetic acid if its enthalpy of combustion to CO2(g) and H2O(l) is –867.0 kJ mol–1 and the enthalpies of formation of CO2(g) and H2O(l) are respectively –393.5 and –285.9 kJ mol–1.
Solution
We have the equation
Given that:
Multiplying equation (ii) by 2 and also equation (iii) by 2, we have,
Adding equations (iv) and (v), we have,
