In general, real gases behave most ideally at temperatures and The behavior of real gases can be described using the van der Waals equation H (V-nb) = nRT The values of a and bare given below for the two real gases carbon dioxide and krypton. The gas in which deviations from ideal behavior due to intermolecular forces are expected to be the largest is The gas that would be expected to behave most like an ideal gas at high pressures is Gas CO₂ Kr a 3.59 2.32 atm tm/mol²) b (L/mol) 4.27 x 10-2 3.98 x 10-2 pressures.

2. Determine the density of steam at 200 bar and 400 °C. a) Use the ideal gas law b) Use the compressibility factor. c) How can you easily verify your number? How well did the models work?

A system consisting of 0.20 mol of supercooled gaseous water (95°C, 1 bar) partially condenses to liquid water; the process is done adiabatically at constant pressure.         At equilibrium, what is the temperature of the system? How many moles of gaseous water have condensed? Calculate the entropy change for the process.

You have a bottle of water, still sealed. You open the bottle. Immediately following, is the fugacity of the water in the liquid greater than, less than, or the same as the water vapor present in the air in the room? Suppose you leave the cap off and let it sit there over the weekend. How do the fugacities now compare?