Enthalpies of Formation - Enthalpies of Formation Using...

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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 H for converting various liquids to the gas phase are listed in tables of enthalpies of vaporization H for melting solids to liquids are listed in tables of enthalpies of fusion H for for combusting a substance in oxygen are listed in tables of enthalpies of combustion The enthalpy change associated with the formation of a compound from its constituent elements is called the enthalpy of formation ( H f ) Conditions which influence enthalpy changes include: temperature pressure state of reactants and products ( s, g, l, aq ) 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
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Enthalpies of Formation - Enthalpies of Formation Using...

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