Mr[CuCl2] = Ar[Cl] * 2 + Ar[Cu] = 35.5 * 2 + 64 = 135
Mr[P2O5] = Ar[P] * 2 + Ar[O] * 5 = 31 * 2 + 16 * 5 = 142
Mr[Na2CO3] = Ar[C] + Ar[Na] * 2 + Ar[O] * 3 = 12 + 23 * 2 + 16 * 3 = 106
Mr[Ca3(PO4)2] = Ar[Ca] * 3 + Ar[O] * 8 + Ar[P] * 2 = 40 * 3 + 16 * 8 + 31 * 2 = 310
Объяснение:
Mr[CuCl2] = Ar[Cl] * 2 + Ar[Cu] = 35.5 * 2 + 64 = 135
Mr[P2O5] = Ar[P] * 2 + Ar[O] * 5 = 31 * 2 + 16 * 5 = 142
Mr[Na2CO3] = Ar[C] + Ar[Na] * 2 + Ar[O] * 3 = 12 + 23 * 2 + 16 * 3 = 106
Mr[Ca3(PO4)2] = Ar[Ca] * 3 + Ar[O] * 8 + Ar[P] * 2 = 40 * 3 + 16 * 8 + 31 * 2 = 310
Объяснение: