Ответ:
Mr[Na2O] = Ar[Na] * 2 + Ar[O] = 22.98976928 * 2 + 15.9994 = 61.97893856
Mr[Al(OH)3] = Ar[Al] + Ar[O] * 3 + Ar[H] * 3 = 26.9815386 + 15.9994 * 3 + 1.00794 * 3 = 78.0035586
Mr[Fe2S3] = Ar[Fe] * 2 + Ar[S] * 3 = 55.845 * 2 + 32.065 * 3 = 207.885
Mr[HNO3] = Ar[H] + Ar[N] + Ar[O] * 3 = 1.00794 + 14.0067 + 15.9994 * 3 = 63.01284
Объяснение:
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Ответ:
Mr[Na2O] = Ar[Na] * 2 + Ar[O] = 22.98976928 * 2 + 15.9994 = 61.97893856
Mr[Al(OH)3] = Ar[Al] + Ar[O] * 3 + Ar[H] * 3 = 26.9815386 + 15.9994 * 3 + 1.00794 * 3 = 78.0035586
Mr[Fe2S3] = Ar[Fe] * 2 + Ar[S] * 3 = 55.845 * 2 + 32.065 * 3 = 207.885
Mr[HNO3] = Ar[H] + Ar[N] + Ar[O] * 3 = 1.00794 + 14.0067 + 15.9994 * 3 = 63.01284
Объяснение: