∆fH (C2H4) = 12.5 kcal .

Question

Given the following data :

∆_fH (C₂H₄) = 12.5 kcal 

Heat of atomisation of C = 171 kcal

Heat of atomisation of H = 521 kcal

Bond energy of C-H bond = 99.3 kcal

What is C = C bond energy?.

a. 140.7 kcal

b. 36 kcal

c. 40 kcal

d. 76 kcal

Answer 1

Correct option is a. 140.7 kcal