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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.

A

`29 kcal`

B

`14.7 kcal`

C

`20.6 kcal`

D

`18.6 kcal`

Text Solution

Verified by Experts

The correct Answer is:
C
`DeltaH_("reaction") = sum BE (R ) - sum BE (P)`
`=[5(C_(s to g)) + 4(H - H) - [2 (C - C) + 2( C = C) + 8(C - H)]`
`[5 xx 171 + 4 xx 1040 -[2 xx 83 + 2 x 147 + 8 xx 98.8] = 20.6 kcal`
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