What is the formulae of compound:
1) ferrous sulphate
2) sodium sulphate
3) magnesium hydrogen carbonate
4) cupric oxide
5) cuprous oxide
6) hydrogen peroxide
7) Sodium acetate
8) Lead Nitrate
9) sodium zincate
1) ferrous sulfate FeSO4
2) sodium sulphate Na2SO4
3) magnesium hydrogen carbonate Mg(HCO3)2
4) cupric oxide CuO
5) cuprous oxide Cu2O
6) hydrogen peroxide H2O2
7) Sodium acetate C2H3NaO2
8) Lead Nitrate Pb(NO3)2
9) sodium zincate H4Na2O4Zn