Mr[CO2] = Ar[C] + Ar[O] * 2 = 12 + 16 * 2 = 44
Mr[Na2S] = Ar[Na] * 2 + Ar[S] = 23 * 2 + 32 = 78
Mr[Al2O3] = Ar[Al] * 2 + Ar[O] * 3 = 27 * 2 + 16 * 3 = 102
Mr[BaCl2] = Ar[Ba] + Ar[Cl] * 2 = 137 + 35 * 2 = 208
Объяснение:
Mr[CO2] = Ar[C] + Ar[O] * 2 = 12 + 16 * 2 = 44
Mr[Na2S] = Ar[Na] * 2 + Ar[S] = 23 * 2 + 32 = 78
Mr[Al2O3] = Ar[Al] * 2 + Ar[O] * 3 = 27 * 2 + 16 * 3 = 102
Mr[BaCl2] = Ar[Ba] + Ar[Cl] * 2 = 137 + 35 * 2 = 208
Объяснение: