$x-$ a $2cm$ diameter ball of salt $($concentration is $3mo\frac{l}{m}l)$ is moving in distilled water, the convective mass transter coefficient is $0\mathrm{.}5(m^2)$ s find initial rate of salt transfer.

a$.2\mathrm{.}84mo\frac{l}{sec*c{m}^2}$

b$.18\mathrm{.}84mo\frac{l}{sec*c{m}^2}$

c$.1\mathrm{.}18mo\frac{l}{sec*c{m}^2}$

d$.1\mathrm{.}88mo\frac{l}{sec*c{m}^2}$