For all ordinary purposes the arithmetic mean is entirely satisfactory, and equation (7.28) is changed to yi dy 1 - y2

The calculation of the number of transfer units for dilute mixtures can be simplified. When the gas mixture is dilute, the second term of equation (7.29) becomes negligible and the equation may be simplified as follows:

yi dy

If the equilibrium curve and the operating line in terms of mole fraction are considered as straight lines, it is possible to rewrite equation (7.32) as:

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