Найти Мг NiSO4, NaCl, Cu(OH)2, H2S

Mr(NiSO4) = 59 + 32 + 16*4 = 155

Mr(NaCl) = 23+35 = 58

Mr(Cu(OH)2) = 63,5 + 16*2 = 1*2 = 97,5

Mr(H2S)=1*2 + 32 = 34