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Calculate the standard heat of formation...

Calculate the standard heat of formation of propane if its heat of combustion is `-2220.2kj mol^(-1)`. The heats of formation of `CO_2(g) " and " H_2O(l)` are `-394 .12 and -286.31 kJ mol^(-1)` respectively.

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`-107.4 kJ mol^(-1)`
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Ethylene on combustion gives carbon dioxide and water. Its heat of combustion is 1410.0 kJ mol^(-1) . If the heat of formation of CO_(2) and H_(2)O are 393.3 kJ and 286.2 kJ , respectively. Calculate the heat of formation of ethylene.

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