Ответ:

lr(Na * 2CO * 3) = 2Ar(Na) + Ar(C) + 3Ar(O)

= 2(23) + 12 + 3(16) = 106

Ir(Fe2(SO4)3)= 2Ar(Fe) + 3Ar(S) + 12Ar

(O) = 110 + 96 + 192 = 398

Mr(Cu(OH) * 2) = Ar(Cu) + 2Ar(O) + 2Ar (H) = 63 + 32 + 2 = 97

Hr(Al2O3)= 2Ar(Al) + 3Ar(O) = 54 + 48 102.

Mr ( Ca(ClO * 4) * 2 = Ar(Ca) + 2Ar(Cl) + 6Ar (O) = 40 + 70 + 96 = 206

Mr(CuSO4^ * 5H2O)= Mr(CuSO * 4) +

5Mr(H2O):

Mr(CuSOA) = Ar(Cu) + Ar(S) + 4Ar(O) =

63 + 32 + 64 = 159

5Mr(H * 2O) = 1OAr(H) + 5Ar(O) = 1O + 8O = 90.

Torдa Mr (CuSO4^ * 5H * 2O )=90+159=

249.