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reaksi 2 dibalik entalpinya jd negatif
reaksi 3 juga dibalik lalu dikali 2 entalpinya jd negatif
CO2 + 2SO2 --> CS2 + 3O2 +1110
C + O2 --> CO2 -494
2S + 2 O2 --> 2SO2 -594
coret yg d ruas kanan kiri sama
hasilnya
C + 2S --> CS2 delta H = +22 kj