Уравнение эндотермической реакции: А.CaCO3=CaO + CO2-Q.
Б.CaC2 + 2H2O=Ca(OH)2 + C2H2 +Q.
В.KOH +HCl=KCl + H2O+Q.
Г.2H2 +O2=2H2O +Q.
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