Расставьте коэффициенты в схемах и уравнениях химических реакций: 
Na + H2O = NaOH + H2;
CaCO3 = CaO + CO2;
Zn + HCl = ZnCl2 + H2;
S + O2 = SO2;
Na2O + H2O = NaOH;
NaOH + H2SO4 = Na2SO4 + HO
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