Calculate the mass flux of benzene through a

layer air $10mm$ thick at $25C$ and $200k\frac{N}{m^2}$

total pressure. The partial pressure of benzene

is $6k\frac{N}{m^2}$ at the left side of the layer and $1$

$k\frac{N}{m^2}$ at the right side. The mass diffusivity at

this temperature and pressure is $4\mathrm{.}4{10}^{-6}$

$\frac{m^2}{s}.$