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2.In a rectification column, toluene is diffusing from gas to liquid and benzene from liquid togas at temperature of 30°C and pressure 101.3 kN/m² under conditions of equal molar counter diffusion. At one point in the column, the molal concentrations of toluene on the two sides of a gas film thick 0.5 mm are 70% and 20%, respectively. Assuming the diffusivity of benzene-toluene vapour under the operating conditions to be 0.38 x 105 m²/s, estimate the rate of diffusion of toluene and benzene in kg/hr across an area of 0.01 m². The molecular weight of toluene and benzene are 92 and 78 g/mol, respectively. The ideal gas constant is equal to 8.314 m³-Pa-K-¹.mol-¹.(30 marks)

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