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SO2, O=-2
S + 2(-2) = 0
S=+4
O2 = 0
SO3 , O=-2
S + 3(-2) = 0
S=+6
2SO2 + O2 → 2SO3
S : +4 ===> +6 oksidasi / reduktor (SO2 => SO3)
O : 0 ===> -2 reduksi / oksidator (O2 => SO3)