Ответы на вопрос:
Mr[CuO] = Ar[Cu] + Ar[O] = 63.546 + 15.9994 = 79.5454 = 80
Mr[K3PO4] = Ar[K] * 3 + Ar[P] + Ar[O] * 4 = 39.0983 * 3 + 30.973762 + 15.9994 * 4 = 212.266262 = 212
Mr[MgCu2] = Ar[Mg] + Ar[Cu] * 2 = 24.305 + 63.546 * 2 = 151.397 = 151
Объяснение:
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