Q$2)$ NaCl$(A),$ is diffusing through a $2\mathrm{.}0mm$ thick thin film of water $($B$)$ at $283K.$ At one

boundary of the film, point $1,$ the concentration of NaCl is $10\mathrm{.}0wt\%($with a density of ${}_1=$

$1050k\frac{g}{m^3}),$ while at the other boundary, point $2,$ it is $5\mathrm{.}0wt\%$NaCl $($with a density of ${}_2=$

$1025k\frac{g}{m^3}).$ The diffusion coefficient of NaCl in water is $1\mathrm{.}6{10}^{-9}\frac{m^2}{s}.$ Assuming a steady

state and one boundary impermeable to water,

a$)$ Calculate the flux of NaCl in kgmo$\frac{l}{s}*m^2$

b$)$ Calculate the flux of NaCl in kgmo$\frac{l}{s}*m^2$ at $313K,$ assuming density is the same as in

$283K.$