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Diketahui energi ikatan sebagai berikut :
C – H = 40 Kj/mol
C = O = 80 Kj/mol
O – H = 45 Kj/mol
O = O = 50 Kj/mol
Jika pada reaksi :
C2H2 + O2 → CO2 + H2O (belum setara) ΔH = - 200 Kj/mol
H-C≡C-H + O=O → O=C=O + H-O-H
Maka energi ikatan, C ≡ C adalah ....