Subject: Chemistry
Book: General Chemistry
The standard enthalpy of formation (ΔHf°) is the enthalpy change when one mole of a compound is formed from its elements in their standard states (1 atm, 25 °C). These values form the basis for calculating reaction enthalpies using Hess’s law. For instance, ΔHf° of CO2(g) is –393.5 kJ/mol. Compiling these data in tables enables quick assessment of reaction energetics.
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