The same reaction can be endothermic or exothermic at different temperatures
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I have a chemical reaction for which I need to calculate its reaction heat; under normal temperature conditions, the calculation based on standard molar free energy indicates that it is an endothermic reaction. Since values such as enthalpy and entropy are functions of temperature, is it possible that when the reaction temperature rises to 1250 degrees Celsius, the calculated enthalpy change indicates that the surface reaction is exothermic? I welcome feedback from all teachers.
Of course, such a possibility exists. Temperature is also one of the factors that affect enthalpy, and this phenomenon occurs frequently. The basic thermodynamic equation is dH = cdt; clearly, a change in temperature causes a change in enthalpy.
It’s possible; enthalpy has an important relationship with temperature changes