Question

define fugacity and activity

Answer 1

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Answer 2

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Fugacity=> In chemical thermodynamics, the fugacity of a real gas is an effective partial pressure which replaces the mechanical partial pressure in an accurate computation of the chemical equilibrium constant. ... For a gas, the activity is simply the fugacity divided by a reference pressure to give a dimensionless quantity.

Activity=> In chemical thermodynamics, activity (symbol a) is a measure of the "effective concentration" of a species in a mixture, in the sense that the species' chemical potential depends on the activity of a real solution in the same way that it would depend on concentration for an ideal solution.

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