1)3Ba(OH)2+2H3PO4=Ba3(PO4)2+6H2O
3Ba+6OH+6H+2PO4=Ba3PO4+6H2O
2)2HCl+Na2S=2NaCl+H2S
2H+2Cl+2Na+S=2Na+2Cl+2H+S
3)K2CO3+2HNO3=2KNO3+H2O+CO2
2K+CO3+2H+2NO3=2K+2NO3+H2O+CO2
CO3+2H=H2O+CO2
31г Х г2Na2O2+2H2O->4NaOH+O2124 г. 160х=160*31/124х=40 г
Na:
1) Na2O + H2O = NaOH
2) NaOH + HCl = NaCl + H2O
3) NaCl + Mg(OH)2 = MgCl2 + NaOH
Ba:
1) Ba + O2 = BaO
2) BaO + H2O = Ba(OH)2
3) Ba(OH)2 + H2SO4 = BaSO4 + H2O
Ca:
1) Ca + O2 = CaO
2) CaO + H2SO4 = CaSO4 + H2O