LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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Consider a chemical reaction that begins with
reactants in equilibrium at some particular
temperature and pressure and ends with products in
equilibrium states at the same temperature and
pressure. The enthalpy change of the reaction is
given by
where ∆n i is the change in the amount of substance
number i. We say that one mole of reaction occurs if
for each substance. That is, a number of moles of a
product appears that is equal to that product’s
stoichiometric coefficient, and a number of moles of a
reactant disappear that are equal to the magnitude of
its stoichiometric coefficient.
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