Problem 2:

a) In a 250 m3 laboratory, a 2 litre bottle was filled to the top with n-hexane and sealed at T = 20C. That air conditioning in the building failed and the temperature rose to T = 35C. Use the Peng-Robinson equation to calculate the final pressure in the bottle.

b) The pressure from part (a) was large enough that the bottle broke and spilled the hexane. To determine if the hexane will evaporate first calculate the fugacity of the pure liquid hexane. Justify how you obtained values for VL, Psat, and sat.

c) If the vapor phase is an ideal gas mixture, will all, none, or some of the hexane evapo- rate? What is the final concentration of hexane in the atmosphere in the laboratory?

d) Locate a material safety data sheet for hexane. Is the atmosphere in the laboratory toxic? Is the concentration of hexane above the LEL (lower explosive limit given as percent by volume) and the temperature above the flash point?