A)M (H2O) = 18 , (H2S) = 34, (NH3)=17, (PH3)=34, (HCl)= 36,5
б) (SO2)= 64, (SO3)=80, (CO2)=40, (SiO2)=60, (Al2O3)=102 ,(CaO)=56 , Li2O= 16
в)(N2O)=44, (NO)=30, (N2O3)=76 , (NO2)= 46
г) (NaCl)=58,5 , (FeCl3)=162,5 , (CuS)=96, (Al2S3)=150 , (KBr)= 119
д) (NaOH)=40, ( Ca(OH)2)=74 ,(H2SO4)=98, (HNO3)=63