Mr[NH3] = Ar[N] + Ar[H] * 3 = 14.0067 + 1.00794 * 3 = 17.03052
Mr[AlCl3] = Ar[Al] + Ar[Cl] * 3 = 26.9815386 + 35.453 * 3 = 133.3405386
Mr[Fe2O3] = Ar[Fe] * 2 + Ar[O] * 3 = 55.845 * 2 + 15.9994 * 3 = 159.6882
Mr[H2S] = Ar[H] * 2 + Ar[S] = 1.00794 * 2 + 32.065 = 34.08088
Объяснение:
