Объяснение:

Mr(H3PO4) = 1×3+31+16×4=98

Mr(PbO2)=207+16×2=238

Mr(SO2)= 32+16×2=64

Mr(P2O3)=31×2+16×3=110

Mr(FeCl3)=56+35×3=161

Mr(CuSO4)=63+32+16×4=143

Mr(Br2)=80×2=160

Mr(HClO4)=1+35+16×4=84

Mr(Al(NO3)3)= 27+14×3+(16×3)×3=213

Mr(C6H12O6)=12×6+1×12+16×6=180