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Molar enthalpy of combustion of C(2)H(2)...

Molar enthalpy of combustion of `C_(2)H_(2)(g),C_("graphite")andH_(2)(g)` are -1300,-394, and -286 KJ/mole respectively , then , Calculate Bond enthalpy of `C-=C` bond inKJ /mole:
`"Given" : DeltaH_("sub") (C_("graphite"))=715 KJ//"mole"`
`DeltaH_(BE)(H-H)=436 KJ//"mole" `
`DeltaH_(BE)(C-H)=413KJ//"mole"`

A

415

B

610

C

1215

D

814

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The correct Answer is:
d
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The molar enthalpies of combustion of C_(2)H_(2)(g), C("graphite") and H_(2)(g) are -1300,-394 , and -286 kJ mol^(-1) , respectively. The standard enthalpy of formation of C_(2)H_(2)(g) is

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