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NaHSO4 itu Na=+1 H=+1 O=-2
1+1+S+(-2x4)=0
2+S-8=0
S=+6
SO3 itu O=-2
S+(-2x3)=0
S=6
H2S2O7 itu H=+1 O=-2
(1x2)+(2S)+(-2x7)=0
2+2S-14=0
2S=12
S=6