Practice

Components A and B of a binary gas mixture diffuse in opposite directions at equal molar rates (equimolar counter-diffusion) across a gas film 2 mm thick at 100 °C and 101.3 kPa. The partial pressure of A is 20 kPa at one face of the film and 5 kPa at the other, as shown, and the mass diffusivity of A in B is $D_m = 2.0\times10^{-5}$ m²/s. The molar flux of A across the film is most nearly:

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