Na2SO4=23×2+32+16×4=142
Al(NO3)3=27+(14+16×3)×3=213
AgNO3=108+14+16×3=170
H2PO4=1×2+31+16×4=97
Fe2O3=56×2+16×3= 160
Na2SO4=23×2+32+16×4=142
Al(NO3)3=27+(14+16×3)×3=213
AgNO3=108+14+16×3=170
H2PO4=1×2+31+16×4=97
Fe2O3=56×2+16×3= 160