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nature : enthalpy is also known as combustion (enthalpy of combustion). The manual identified standards (Moore) combustion enthalpies (Symbol �cH θ m), is under a state standard molar pure substances incomplete combustion, production standards under the most stable oxidation or quality time alone , the incremental system enthalpy (that is the process of thermal effects). The so-called "the most stable oxides and single-quality", opened in 298.15 (25 ° C) is CO2 (gas), H2O (liquid), SO2 (gas), N2 (gas ), HCl aqueous solution and free metals. For example, the 298.15 standard open burning methane enthalpy of -890.31 kJ / Mount. Both negative enthalpy combustion, combustion means is exothermic. It is important to the thermodynamic data, in addition to direct applied research, technology design and production, but is mainly used for calculating the response (in particular, it objects to the participation of response) reaction heat (enthalpy), and some of the basic thermodynamic data, thereby solving the problem of chemical thermodynamics.
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