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Diketahui energi ikatan rata-rata sebagai berikut :
C = C = 146 kkal/mol
C – C = 83 kkal/mol
C – H = 99 kkal/mol
C – Cl = 79 kkal/mol
H – Cl = 103 kkal/mol
Perubahan entalpi pada reaksi eliminasi senyawa halo alkena, menurut persamaan :
CH3 – CH2 – Cl → H2C=CH2 + HCl
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