The standard molar enthalpy of formation is defined as the heat of reaction that occurs in the direct formation of one mole of the pure substance starting from the pure elements at constant pressure. For the conversion of carbon and oxygen to CO2 , the standard enthalpies of formation can be determined by means of calorimetry. Through this experiment the enthalpies of reaction for the combustion of carbon and carbon monoxide are measured while the enthalpy of formation of CO2 is calculated using Hess’s law.
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