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Calculate the enthalpy of formation of a...

Calculate the enthalpy of formation of acetic acid `(CH_(3)COOH)` if its enthalpy of combustion is `867 kJ mol^(-1)`.The enthalpies of fromation of `CO_(2)(g)` and `H_(2)O(l)` are -393.5 and -285.9 `kJ mol^(-1)` respectively.

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The correct Answer is:
`-491.8 kJ mol^(-1)`
Aim `: 2C(s) + 2H_(2) (g) + O_(2)(g) rarrCH_(3)COOH,DeltaH = ?`
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