yg pahamm bantu dong. buat dikumpulin

C=C + 4(C-H) + Cl-Cl. - (C-C + C-Cl + 4(C-H))

= 612 + 4×414 + 243 - (347 + 331 + 4×414)
= 612 + 1656 + 243 - (678 + 1656)
= 117 KJ mol ^ -1