Відповідь:

Mr(CuCl2, )=64+35,5*2=135

Mr(FeS,)=56+32=88

Mr( Al2(SO4)3)=27*2+(32+16*4)*3=342

Mr( MgO,)= 24+16=40

Mr(Fe(OH)3​)=56+(1+16)*3=107

Пояснення:

Ответ:

Mr[CuCl2] = Ar[Cu] + Ar[Cl] * 2 = 63.546 + 35.453 * 2 = 134.452 = 134

Mr[FeS] = Ar[Fe] + Ar[S] = 55.845 + 32.065 = 87.91 = 88

Mr[Al2(SO4)3] = Ar[Al] * 2 + Ar[S] * 3 + Ar[O] * 12 = 26.9815386 * 2 + 32.065 * 3 + 15.9994 * 12 = 342.1508772 = 342

Mr[MgO] = Ar[Mg] + Ar[O] = 24.305 + 15.9994 = 40.3044 = 40

Mr[Fe(OH)3] = Ar[Fe] + Ar[O] * 3 + Ar[H] * 3 = 55.845 + 15.9994 * 3 + 1.00794 * 3 = 106.86702 = 107

Объяснение: