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Heat of formation of water and heats of ...

Heat of formation of water and heats of combustion of ethylene and acetylene are respectively `286, -1410 and -1299 kJ mol^(-1)`, Calculate the heat of the reaction,
`C_2H_(2(g)) + H_(2(g)) to C_(2)H_(4(g))`.

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`175kJ mol ^(-1)`
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