LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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2.8. Calculation of Energy Changes of Chemical
Reactions
It would be possible to make tables of energy
changes of formation and to calculate
∆U values in the same way as ∆H values are
calculated from enthalpy changes of formation.
However, adequate accuracy can be achieved
without constructing a table of ∆ f U values. From the
definition of the enthalpy we can write an expression
for ∆U for a chemical reaction:
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Ordinarily ∆(PV) is much smaller than ∆H
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