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1. reaksi kiri
C2H4 = 1 ikatan C=C dan 4 ikatan C-H = 345 + (415x4) = 345 + 1660 = 2005
Cl2 = 1 ikatan Cl-Cl
2. reaksi kanan
C2H4Cl2 = 1 ikatan C-C + 2 ikatan C-Cl + 4 ikatan C-H = 345 + (2x239,7) + (4x415) = 345 + 479,4 + 1660 = 2848,4
reaksi kiri - reaksi kanan = -843,4
semoga benar dan membantu.