List of top Mass Transfer Questions on Mass transfer coefficients asked in GATE Chemical Engineering

Consider the steady, unidirectional diffusion of a binary mixture of A and B across a vertical slab of dimensions 0.2 m × 0.1 m × 0.02 m as shown in the figure. The total molar concentration of A and B is constant at 100 mol m\(^{-3}\). The mole fraction of A on the left and right faces of the slab are maintained at 0.8 and 0.2, respectively. If the binary diffusion coefficient \( D_{AB} = 1 \times 10^{-5} \) m\(^2\) s\(^{-1}\), the molar flow rate of A in mol s\(^{-1}\), along the horizontal \( x \) direction is: