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Équilibre les équations chimiques suivantes: CH4+O2___CO2+H2O C3H8+O2___CO2+H2O C5H12+O2___CO2+H2O C2H6+O2___CO2+H2O C4H14+O2___CO2+H2O C6H14+O2___CO2+H2O CO2+C___CO C+O2___CO Mg+O2___MgO Cu+O2___CuO Cu+CO2___CuO+C Mg+CO2___MgO+C Fe+O2___Fe3O4 Al+O2___Al2O3 Al+CO2___Al2O3+C C2H6O+O2___CO2+H2O C4H10O+O2___CO2+H2O CH4O0+O2___CO2+H2O C3H8O+O2___CO2+H2O​

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