Пожалуйста помогите! Расставьте коэффициенты: а) CH4 + O2 =>CO2 + H2O
б) Ca+ HCl => CaCl + H2
в) Mg + O2 => MgO
г) H2S + O2 => H2O + SO2
д) NaBr + Cl2 => NaCl + Br2
е) CaCl2 + NaOH => Ca(OH)2 + NaCl
ё) CaCO3 => CaO + CO2
ж) Al + O2 => Al2O3
з) Ag + S => Ag2S
и) (NH4)2Cr2O4 => N2= Cr2O3 + H2O
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