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Mass Transfer Question on Mass transfer coefficients

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^{-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 DAB=1×10−5D_{AB} = 1 \times 10^{-5} m2^2 s−1^{-1}, the molar flow rate of A in mol s−1^{-1}, along the horizontal xx direction is:
steady, unidirectional diffusion of a binary mixture

A

6×10−46 \times 10^{-4}

B

6×10−66 \times 10^{-6}

C

3×10−63 \times 10^{-6}

D

3×10−43 \times 10^{-4}

Answer

6×10−46 \times 10^{-4}

Explanation

Solution

The correct option is (A) :6×10−46 \times 10^{-4}