(CuOH)2CO3--> 2CuO+CO2+H2O
CuO+2HNO3--> Cu(NO3)2 +H2O
2Cu(NO3)2--> 2CuO + 4NO2+ O2
3CuO+2NH3--> 3Cu+ N2+ 3H2O
И в К2О ,и в ВаО-ионная связь
<span>3Mg(NO3)2+ 2Na3PO4 --> Mg3(PO4)2 + 6NaNO3</span>
Mr(ZnCO3) = Mr = Ar(Zn) + Ar(C) + 3Ar(O) = 65 + 12 + 3 * 16 = 125
w(Zn) = Ar(Zn) / Mr = 65 / 125 = 0.52 = 52%
w(C) = Ar(C) / Mr = 12 / 125 = 0.096 = 9.6%
w(O) = 3Ar(O) / Mr = 48 / 125 = 0.384 = 38.4%