LECTURE PHYSICAL CHEMISTRY 3rd EDITION ROBERT G. MORTIMER

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In a mixture of gases that cannot be assumed
to be ideal, we define f i , the fugacity of
component i, by the relation
where µ ◦ i is the same standard-state chemical
potential as for the pure gas: the hypothetical
ideal-gas state at pressure P ◦ and whatever
temperature is being considered.
We will not discuss the evaluation of the
fugacity in a mixture of nonideal gases.
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