Question

(2c). (4p) Find the mass of air in a cuboid classroom of dimensions 7m ´ 8m ´ 5m, assuming it is an ideal gas at 1 atm and 25 ^oC.

(2d). (5p) Use the ideal gas equation of state to find the specific volume of water vapor at 8 kPa and 100 ^oC, if the molar weight of water is 18.0 g/mol. Why is the ideal gas equation a good approximation for water at this temperature and pressure? (Tip: you need check it using the compressibility factor)

(2e). (5p) Based on the Nelson-Obert general compressibility chart (Figure A-15), please evaluate the compressibility factor, Z, for the known reduced temperature and pressure, T_R = 1.2 and P_R=2.0 (2.5p). Can this substance be considered as an ideal gas? Explain! (2.5p).