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Calculate heat of combusion of ethene:...

Calculate heat of combusion of ethene:

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`DeltaH=`Sum of bond energies of reactants
`-` Sum of bond energies of products
`=[DeltaH_((C=C))+4DeltaH_((C-H))+3xxDeltaH_((O=O))]-[4xxDeltaH_((C=O))+4xxDeltaH_((O-H))]`
`=[619+4xx414+3xx499]-[4xx724+4xx460]`
`=-964kJ " "mol^(-1)`.
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