For a system in which component $\mathrm{A}$ is transferring from the gas phase to the liquid phase, the equilibrium relation is given by $p_{A, i}=0.80 x_{A, i}$ where $p_{A, i}$ is the equilibrium partial pressure in atm and $x_{A, i}$ is the equilibrium liquid concentration in molar fraction. At one point in the apparatus, the liquid stream contains $4.5 \mathrm{~mol} \%$ and the gas stream contains $9.0 \mathrm{~mol} \%$ of A. The total pressure is $1 \mathrm{~atm}$. The individual gas-film coefficient at this point is $k_{G}=3.0 \mathrm{~mol} / \mathrm{m}^{2}$-s-atm. Fifty percent of the overall resistance to mass transfer resides in the liquid phase. Evaluate

(a) The overall mass-transfer coefficient, $K_{y}$

(b) The molar flux of A

c) The liquid interfacial concentration of A