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Dear student,
Enthalpies of Formation
Using Hess's Law we can calculate reaction enthalpies for a variety of reactions using tables of known enthalpies
Many experimentally determined enthalpies are listed by the type of process
The enthalpy change associated with the formation of a compound from its constituent elements is called the enthalpy of formation (DHf )
Conditions which influence enthalpy changes include:
The standard state of a substance is the form most stable at 298 ?K (25 ?C, or standard "room temperature") and 1 atmosphere (1 atm) of pressure
When a reaction occurs with all reactants and products in their standard states, the enthalpy change is the standard enthalpy of reaction (DH?)
Thus, the standard enthalpy of formation (DH?f)of a compound is the change in enthalpy that accompanies the formation of 1 mole of that substance from its elements, with all substances in their standard states
The standard enthalpy of formation for ethanol (C2H5OH) is the enthalpy change for the following reaction
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