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Calculate heat of formation of isoprene ...

Calculate heat of formation of isoprene using bond energy data.
`5C(s) + 4H_(2)(g) rarr H_(2)C = underset(CH_3)(|)(C ) - HC =CH_(2)`
Given `C - H = 98.8 kcal`
`H - H = 104 kcal`
C – C= 83 kcal
C = C = 147 kcal and `C(s) rarr C(g) = 171 kcal`

Text Solution

Verified by Experts

`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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