PHYSICAL CHEMISTRY:Calculate the pressure exerted by 1.0 mol C2H6 at 1000 K in 100 cm3 using (a) the ideal gas equation and (b) the van der Waals equation. The van der Waals constant for C2H6 are: a = 5.562 bar dm6 mol-2 ; b = 0.06380 dm3 mol-1 answer:[831; 1.72 x 10-3]

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.

The vapor pressure of cyclohexane at 300 K is 0.14139 bar. What is the phase of cyclohexane at 310 K and 0.14139 bar? a) superheated vapor b) compressed liquid c) saturated vapor d) saturated liquid e) two-phase mixture f) We need more information.