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1) Three perfect gases at 20.000C were allowed to mix. Calculate the total pressure and the...

1) Three perfect gases at 20.000C were allowed to mix. Calculate the total pressure and the partial pressure of each gas if the pressures and volumes of the individual gases before mixing were: (8 pts)

Gas 1: Volume 1.0 L, pressure 1.5 bar

Gas 2: Volume 1.5 L, pressure 2.0 bar

Gas 3: Volume 2.5 L, pressure 3.0 bar

2) Humidity levels affects the density of air. Calculate the density difference between a sample of dry air and a sample of moist air with 85% humidity . The pressure and temperature is the same for both samples: 1 atm and 38.000C. The molar mass-1 of dry air is 28.97 g mol and the water vapor pressure at 38.000 C is 49.7 torr.

3) Calculate the pressure for a one-mole sample of air if the temperature is 15.00C and the altitude is 1200 meters above sea level. The volume of this sample is 23.8 liters.

4) The critical temperature and critical pressure of tetrafluorosilane (SiF4) are 259.1 K and 36.7 atm, respectively. (a) Calculate the van der Waals constants, a and b, then (b) using the van der Waals equation calculate the vapor density of this gas at STP conditions.

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