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-2 +5 0 +4
perubahan biloks S = 2 × 1
perubahan biloks N = 1 × 2
awal: FeS + 2 HNO3 → Fe(NO3)2 + S + 2 NO2 + H2O
setara: FeS + 4 HNO3 → Fe(NO3)2 + S + 2 NO2 + 2 H2O