1. A chemical engineer uses waste CO2 from a manufacturing process, instead of chlorofuorocarbons, as a “blowing agent” in the production of polystyrene. Find the density (in g/L) of CO2 and the number of moles per liter (a) at STP (0oC and 1 atm) and (b) at room conditions (20oC and 1.00 atm).