Mr[Na2CO3] = Ar[Na] * 2 + Ar[C] + Ar[O] * 3 = 22.98976928 * 2 + 12.0107 + 15.9994 * 3 = 105.98843856 = 106
Mr[Cu(OH)2] = Ar[Cu] + Ar[O] * 2 + Ar[H] * 2 = 63.546 + 15.9994 * 2 + 1.00794 * 2 = 97.56068 = 98
Объяснение:
