$26\mathrm{.}24$ Ammonia, $N{H}_3,$ is selectively removed from an air$-N{H}_3$ mixture by absorption into water. In this steadystate process, ammonia is transferred by molecular diffusion through a stagnant gas layer $2cm$ thick, and then through a stagnant water layer $1cm$ thick as shown in the figure. The concentration of ammionia at the upper boundary of the

gas layer is $3\mathrm{.}42$mol$\%,$ and the concentration at the lower boundary of the water layer is essentially zero. The temperature of the system is $15C$ and the total pressure on the system is $1$atm. The concentration of ammonia $($species A$)$ at the interface between the gas and the liquid phase is given by the following equilibrium data:

$\backslash$table$[[P_A(mmHg),5\mathrm{.}0,10\mathrm{.}0,15\mathrm{.}0,20\mathrm{.}0,25\mathrm{.}0,30\mathrm{.}0],[c_A(\frac{\text{m}\text{o}\text{l}}{m^3}),6\mathrm{.}1,11\mathrm{.}9,20\mathrm{.}0,32\mathrm{.}1,53\mathrm{.}6,84\mathrm{.}8]]$

Determine the flux of ammonia across both the gas and liquid films. At $15C,$ the diffusivity of ammonia in air is $0\mathrm{.}215c\frac{m^2}{s},$ and the diffusivity of ammonia in liquid water is $1\mathrm{.}77x{10}^{-5}c\frac{m^2}{s}.$