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nature : a certain temperature and pressure, from the most stable single generation a quality Moore pure substances thermal effect. Now many said formation enthalpy, as this formation reaction to the thermal effect of the process system enthalpy increment. State standards (quality and the single production of pure substances are at the state standard) as standard formation enthalpy heat of formation (standard heat of formation), the existing manual called Moore standard formation enthalpy, or standard formation enthalpy, using symbols �f θ _ / sup>m said that units are kJ / Mount (kJ / mol). 298.15 as open (25 ° C) when the diamond and acetylene (gas) �fH θ m respectively +1.896 with -226.73 kJ / Mount. Negative exothermic said that the system of enthalpy decrease.
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