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C + O2 = CO2 delta H = -94,05 kJ
2S + 2O2 = 2SO2 delta H = -141,92 kJ
reaksi total: CS2 + 3O2 = CO2 + 2SO2 delta H = -263,52 kJ/mol
mol CS2 = g/Mr = 19/76 = 0,25 mol
maka kalor yang dilepaskan = -263,52 kJ/mol x 0,25 mol = -65,88 kJ