4 Someone has left 10cm3 of liquid trichloroethylene (TCE) in a graduated cylinder in an unventilated, closed laboratory on Friday at 4pm. The graduated cylinder has an internal diameter of 3cm and a length of 35cm. The lab has a total volume of 600m3 and the air inside it will be stagnant during the weekend. The EPA has established an indoor standard for TCE of 100g/m3 as the maximum allowable concentration of TCE in air for a typical 8-h exposure. Estimate the concentration of TCE in the lab air on Monday at 8am and establish if it is safe to go into the lab unprotected. The density of liquid TCE is 0.703g/cm3; its vapor pressure at 25C is 0.0184 atm and its molecular weight is 114.2g/mol. The diffusivity of TCE in air is 0.08cm2/s. Consider that the atmospheric pressure is 0.91atm. Hint: Assume that the air in the lab is well mixed at all times, so that the process is controlled by the diffusion of TCE in the graduated cylinder. Why would this be a good assumption to use to assess safety