Расставьте коэффициенты: а) CaO + H2O => Ca(OH)2
б) Ca(OH)2 => CaO + H2O
в) H2 + CuO => Cu + H2O
г) Zn + HCl => H2 +ZnCl2
д) CaBr2 + HF => CaF2 + HBr
e) CaCl2 + NaCo3 => CaCo3 + NaCl
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