A pure liquid composed of species A is brought into contact with a stagnant gas which initially contains only species B Evaporation of the liquid begins at !=0, leading to a mixture of A and B in the...

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Extracted text: A pure liquid composed of species A is brought into contact with a stagnant gas which initially contains only species B Evaporation of the liquid begins at !=0, leading to a mixture of A and B in the gas; B is insoluble in the liquid and therefore remains in the gas phase. The liquid interface is maintained at z=0, and the gas occupies the space z>0. The mole fraction of Ain the gas at z=0 is X40. The system is at constant temperature and pressure and the gas mixture is ideal, so that the total molar concentration in the gas is constant, (b) Using a similarity variable show that, de +2(n-0 an =0, O(0) = 1, O(00) =0, (0), 2(1-X40) dn where O(n)=x,/xAD