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Question
The bond energies of C−C, C=C, H−H and C−H are 350, 600, 400 and 410 kJ/mol respectively. The heat of hydrogenation of ethylene is:
The bond energies of C−C, C=C, H−H and C−H are 350, 600, 400 and 410 kJ/mol respectively. The heat of hydrogenation of ethylene is:
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Solution
The correct option is A −170 kJ/mol
CH2=CH2+H2→CH3−CH3
ΔH=∑B.E. (Reactants)−∑B.E. (Products)
=[4(C−H)+(C=C)+(H−H)]−[6(C−H)−(C−C)]
=(C=C)+(H−H)−2(C−H)−(C−C)
=600+400−(2×410)−350
=−170 kJ/mol
CH2=CH2+H2→CH3−CH3
ΔH=∑B.E. (Reactants)−∑B.E. (Products)
=[4(C−H)+(C=C)+(H−H)]−[6(C−H)−(C−C)]
=(C=C)+(H−H)−2(C−H)−(C−C)
=600+400−(2×410)−350
=−170 kJ/mol
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