Рассчитайте относительные молекулярные массы соединений (Mr) (4б):
(a) MgNO3 _____________________________________________________________
(b) Ca(OH)2______________________________________________________________
(c) Н2S _______________________________________________________________
(d) Al2O3 ________________________________________________________________
(a) MgNO3 _____________________________________________________________
(b) Ca(OH)2______________________________________________________________
(c) Н2S _______________________________________________________________
(d) Al2O3 ________________________________________________________________
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Ответ:
Mr[MgNO3] = Ar[Mg] + Ar[N] + Ar[O] * 3 = 24.305 + 14.0067 + 15.9994 * 3 = 86.3099
Mr[Ca(OH)2] = Ar[Ca] + Ar[O] * 2 + Ar[H] * 2 = 40.078 + 15.9994 * 2 + 1.00794 * 2 = 74.09268
Mr[H2S] = Ar[H] * 2 + Ar[S] = 1.00794 * 2 + 32.065 = 34.08088
Mr[Al2O3] = Ar[Al] * 2 + Ar[O] * 3 = 26.9815386 * 2 + 15.9994 * 3 = 101.9612772
Объяснение: