The enthalpy of formation of ethane (C2H6) from ethylene by addition of hydrogen where the bond- energies of C – H, C – C, H – H are 414 kJ, 347 kJ, 615 kJ and 435 kJ respectively is - __________ kJ.

Question

Prashant Kotian · Accepted Answer

Correct answer: .. C2H4(g) + H2(g)  C2H6(g) H = BE(C = C) + 4BE (C – H) + BE (H – H) – BE(C – C) – 6BE (C – H) H = BE(C = C) + BE(H – H) – BE(C – C) – 2BE(C – H) = 615 + 435 – 347 – 2 × 414 = – 125 kJ

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