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-1..........................................................
H2SO4
Mr(H2SO4)=2*1+32+4*16=98
w(H)=Ar(2H)/Mr(H2SO4)*100%=(2*1)/98=0.0204*100%=2.04%
w(S)=32/98=0.3265*100%=32.65%
w(O)=(4*16)/98=0.6531*100%=65.31%
2.04+32.65+65.31=100%