A slab of NaCl measuring $10cm$ locm with edges

sealed is suspended in a well stirred tank of

water. It is found to be loosing weight at the

rate of $50\frac{gm}{\text{m}\text{i}\text{n}}.$ Estimate the mass transfer

coefficients $k_c$ and $k_x$ given that solubility of

NaCl in water is $36gm$ per $100gm$ of water at temperature

in tank i$.$e$.20$ and density of saturated solution

of NaCl at $20C$ density of saturated solution of

NaCl at $20C$ is $1\mathrm{.}197g\frac{m}{c}c.$