Question. You are designing a package for 120 g of chips/crisp that is sensitive to oxygen and fails when it absorbs 100 ppm of oxygen (by weight). Marketing tells you it wants the snack to be in a plastic pouch measuring 5 inches by 5 inches (ignore seems), so it will have a total surface area available for permeation of 50 in? (5 x 5 x 2 sides). You need to recommend an appropriate plastic material for this product, to provide a minimum of 60 days shelf life. Follow these steps: a. Calculate the allowable oxygen gain, in cm at STP. (5 pts) || At this point, you do not know the material you will use, so you do not know the permeability coefficient or the thickness. The better the barrier the plastic you choose, the thinner the material can be to provide the appropriate barrier. Rather than simple trial and error, a sensible approach is to solve for the ratio of P/L that is required. We can solve the basic permeability equation for this ratio: 9 L II At Ap Use the information you have to determine the required value for P/L, expressing your answer in cm3/(100 in? d atm). (5 pts)