Question

which have more standard heat of enthalpy -20kcal/mol , 40kcal/mol , 30kcal/mol​

Answer 1

Answer:

ΔH

f

=2× Binding energy of carbon +2× Binding energy of H

2

+4× bond energy of C−H - Bond energy of C=C

12.5=2×171+2×104.3+4×99.3−Bond energy of C=C

Bond energy of C=C=140.9Kcal