Помогите, уравняйте реакцию, поставьте коэффиценты ( только коэффиценты) P+O2=>P2O5, NaNO3=>NaNO2+O2, AgNO3=>NO2+Ag+O2, BaCl2+Na2SO4=>BaSO4+NaCL, Fe+O2=>Fe304, Fe2O3+HCL=>FeCL3+H20, FeCL3+AgNO3=>AgCL=Fe(NO3)3, CaCO3+HNO3+>Ca(NO3)2+CO2+H20, Fe(OH)3+>Fe2O3+H20, HgO=>Hg+O2
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