The production supervisor of a small pharmaceutical firm has observed a decreasing demand for potassium regurgitol (PRO) over a two-month period, and since the plant manager has been throwing up the low sales of this product at the weekly staff meetings, the supervisor decides to discontinue its production immediately. On the day of this decision, the inventory of PRG is 18,000 kg. Based on the orders on hand. the manager projects the following weekly demand for the next six weeks: Week 1 \ 2 I 3 ! 4 5 6 I Demand D(kglwk) 2385 I 1890 I 1506 11196 950 755 (a) Use a semilog plot of the projected demand figures to derive an equation for D as a function of t(weeks) from the present time. (b) Write a differential balance on the inventory I (kg) of PRG, and integrate it to determine I as a function of t. (c) If the demand continues to follow the projected trend of the next six weeks, how much PRG will eventually have to be discarded?
CHEM 101_Dr. Emil Lecture Notes and In-class problems. CHAPTER 5 NOTES OUTLINE: 5.1 Changes of State 5.2 The Gas Laws 5.3 Gas Mixtures and Partial Pressures 5.1 Changes of State Changes of state are the processes of going from one physical state to another physical state. A change of state is a physical change because covalent bonds are not formed or broken in the process. There are no intermolecular forces in the gas phase but intermolecular forces exist in the liquid phase, and are even more abundant in the solid phase. A change of state from the solid to the liquid phase is melting; the reverse is freezing. A change of state from liquid to gas is vaporization or evaporation; the reverse is condensation. A