146. Use the following data for NH3(g) at 273 K to determine B2p (T) at 273 K. P (bar) 0.10 0.20 0.30 0.40 0.50 0.60 (Z -1)/10-4 1.519 3.038 4.557 6.071 7.583 9.002 0.70 10.551

110. Compare the pressures given by (a) the ideal gas law, (b) the van der Waals equation, and (c) the Redlic-Kwong equation for propane at 400 K and p = 10.62 mol dm³. The van der Waals parameters for propane are a = 9.3919 dm6 bar mol-2 and b = 0.090494 dm³ mol−1. The Redlich-Kwong parameters are A = 183.02 dm bar mol-2 and B = 0.062723 dm³ mol-1. The experimental value is 400 bar.

Research in surface science is carried out using stainless steel ultra-high vacuum chambers with pressures as low as 10-12 torr.  How many molecules are there in a 1.00 cm3 volume at this pressure and at a temperature of 300 K?  For comparison, calculate the number of molecules in a 1.00 cm3 volume at atmospheric pressure and room temperature.  In outer space the pressure is approximately 1.3 x 10-11 Pa and the temperature is approximately 2.7 K (determined using the blackbody radiation of the universe).  How many molecules would you expect find in 1.00 cm3 of outer space?