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Using bond energy data, calculate heat o...

Using bond energy data, calculate heat of formation of isoprene

Given C-H, H-H, C-C, C= C and` C(s) rightarrow C(g)` respectively as 98.8 kcal, 104 kcal, 83 kcal, 147 kcal, 171 kcal.

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`DeltaH_("reaction") = sumBE_(R) - sumBE_(P)`
`=[5(C_(S to g)) + 4(H -H) -[2(C-C) + 2(C=C) + 8(C-H)]`
`[5 xx 171 xx 4 xx 104]-[2 xx 83 2 xx 147+8 xx 98.8] = 20.6` kcal.
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