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Enthalpies of Formation


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Enthalpies of Formation

... 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 DH for converting various liquids to the gas phase are listed in tables of enthalpies of vaporization DH for melting solids to liquids are listed in tables of enthalpies of fusion DH 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 (DHf ) 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

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What our users think of this essay:

"Good at what it attempts to cover, but perhaps a little limited in scope. The calculations are well set out and appear to be accurate, and examples are used well to illustrate the method. The initial introduction helps to give some explanation of the rationale for the method, but this would benefit from including more detail on the theoretical origin of Hess's Law as well as enthalpy diagrams to illustrate the general progress of a reaction. TSR user: Illusionary"
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