Ответ:
Объяснение:
Mr(CaO) = 40 + 16 = 56
Mr(AlCl3) = 27 + 35,5*3 =133,5
Mr(Mg(OH)2 = 24 + 16*2 + 1*2 = 58
Mr(H2SO4) = 1*2 + 32 + 16*4 = 98
Mr(Na2SO4) = 23*2 + 32 + 16*4 = 142
Mr(K2CO3) = 39*2 + 12 + 16*3 = 138
Mr(NaCl) = 23 + 35,5 = 58,5
Mr(CaCO3) = 40 + 12 + 16*3 = 100
Mr(Fe2(SO4)3 = 56*2 + 32*3 + 16*12 = 400