Effect of Temperature on Reaction Enthalpy

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If we know the enthalpy change for a reaction at one temperature, the heat capacities of the reactants and products can be used to determine the heat capacity at a different temperature.
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Does enthalpy of reaction being defined at a particular temperature how imply that a reaction is somehow an isothermal process?

debarghapaul
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Because when H2O (g) is cooled from 700K to 298 K H2O (l) there is a phase change, is there an additional heat value for the heat of vaporization as water changes from a gas to water? Whereas there is no phase change for CO and CO2 from 700K to 298 K so there is no additional heat associated with a phase change?

camillestevenson