The permtability of two polymers A and $B$ to caygen, in $c{m}^{3}ST\frac{P}{24}hf{t}^2$atm. $\frac{?}{\text{m}\text{i}\text{l}}.$ is:

Polymer A: $550$

Polymer B: $25$

$($Note: $1$mil$=00\mathrm{.}001$ inch$)$

a$.$ Calculate the permeability to oxygen of a laminate made of $6$ mils of A and $1$ mil of $B.$

b$.$ Galeulate the total quantity of oxgen $($in $g$ mols$)$ that penetrates in $100$ days inte a pouch made of the said laminate. The total surface area of the pouch is $400c{m}^2.$ The pouch contains a food rich in unsaturated fat, in an atmosphere of pure nitrogen. It is assumed that all the oxygen that penctrate combines quickly with the fat. The storage temperature is $25C.$j