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mol = 140/28 = 5
reaksi pembentukan = C + 1/2O2 → CO
2C(s) + 2O₂(g) → 2CO₂(g), ΔH = -788 kJ/mol (dikali dua agar bisa dimatikan)
2CO₂(g) → 2CO(g) + O₂(g) , ΔH = +569 kJ/mol (reaksi dibalik agar bisa dimatikan)
2C + O2 → 2CO ΔH = -219 kJ/mol (untuk 2 mol )
untuk 5 mol = 5/2 x (-219) = -547.5 kJ/mol