Mr(MgSO4)=24+32+16*4=120
W(Mg)=Ar(Mg)*n/Mr(MgSO4). *100%=24*1/120 *100%=20%
W(S)=Ar(S)*n/Mr(MgSO4)*100%=32*1/120. *100%=27%
W(O)=Ar(O)*n/Mr(MgSO4) *100%=16*4/120 *100%=53%
Mr(MgSO4)=24+32+16*4=120
W(Mg)=Ar(Mg)*n/Mr(MgSO4). *100%=24*1/120 *100%=20%
W(S)=Ar(S)*n/Mr(MgSO4)*100%=32*1/120. *100%=27%
W(O)=Ar(O)*n/Mr(MgSO4) *100%=16*4/120 *100%=53%