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Calculate the heat of hydrogenation , ...

Calculate the heat of hydrogenation ,
`C_(2)H_(4)(g)+H_(2)(g)toC_(2)H_(6)(g)`
Given that, the heats of combustion of ethylene, hydrogen and ethane are -337.0, -68.4 and -373.0 kcal respectively.

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`-32.4kcal`
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