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DanBi
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Al2(SO4)3 2(O.N.of Al)+3[(O.N.of S)+4(O.N.of O)]=0 2(+3)+3(O.N.of S)+12(-2)=0 6+3(O.N.of S)-24=0 3(O.N.of S)=24-6 3(O.N.of S)=18 O.N.of S=18/3 O.N.of S=+6
