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%
P2O5+H2O=H3PO4
Поставь 5 звезд если не жалко
Мr(h2beo2)=2+9+32=43 Mr(Fe2(so4)3)=112+(32+64)×3=112+288=400 Mr(mgo)=24+16=40