Q$1)$ A blister package typically consists of two main components: a flat lidding sheet made of

impermeable aluminum foil, and a second, formed sheet made of polymer material. The formed

sheet, with a thickness $($L$)$ of $50m,$ contains troughs designed to hold individual tablets. Each

trough has a diameter $($D$)$ of $5mm$ and a depth $($h$)$ of $3mm.$ The binary diffusion coefficient

for water vapor in the polymer material is given as

$D_{AB}=6{10}^{-14}\frac{m^2}{s},$ while aluminum is known to be impermeable to water vapor.

Given molar concentrations of water vapor at the outer and inner surfaces of the polymer

sheet is $C_{Al}={4\mathrm{.}5}^{**}{10}^{-3}$kmo$\frac{l}{m^3}$ and $C_{A2}={0\mathrm{.}5}^{**}{10}^{-3}$kmo$\frac{l}{m^3}$ respectively.

Determine the rate at which water vapor transfers through the trough wall to the tablet.