1)CaO + H2O = Ca(OH)2
2)BaO + H2O = Ba(OH)2
3)CaO + CO2 = CaCO3
4)P2O5 + 3H2O = 2H3PO4
5)3CaO + P2O5 = Ca3(PO4)2
6)MgO + 2HCl = MgCl2 + H2O
CuSO4+2NaOH=Cu(OH)2+Na2SO4
NaOH ---------- Cu(OH2)
x-----------49
2*40------98
x=49*2*40/98=40г
Ответ: 40г.
2Na+Cl2=2NaCl
NaCl+AgNO3=AgCl+NaNO3
2AgCl=2Ag+Cl2
4Li+O2=2Li2O
Li2O+H2O=2LiOH
2LiOH+ZnSO4=Li2SO4+Zn(OH)2
Zn(OH)2+2NaOH=Na2ZnO2+2H2
4Li+6HNO3=4LiNO3+NH4NO3+H2O
Zn(OH)2=ZnO+H2O
Li2O +ZnO=Li2ZnO2