Question

If enthalpies of methane and ethane are respectively 320 and 360 cal then the bond energy of C−C bond is???​

Answer 1

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• $\color{red}{120cal}$

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here; c → C(carbon) , h→ H(hydrogen)

I have indicated in small letters;

CH4 has 4 C-H bonds

Ec-h = 320 ÷ 4 = 80.

In C2H6; 6→C-H ; 1→C-C

360 = Ec-c + 6Ec-h

360 = Ec-c + 6 x 80

====> Ec-c = 120 cal

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Answer 2

Answer:

120cal

Explanation:

Thus the bond energy of the C=C bond will be 120 cal.