a) Discuss how the phase equilibria of mixtures are represented using diagrams similar to the pressure-temperature and pressure-specific volume diagrams for one- component systems. Use the example of a mixture of ethane and heptane to illustrate your discussion.
(b) Compare the Van der Waals equation of state with the Redlich-Kwong equation of state for gases.
(c) A 140 litre cylinder containing 20 kg of propane stands in the hot sun. A pressure gauge shows that the pressure inside is 4.5MPa (gauge).
Calculate the temperature of the propane in the cylinder using:
The Van der Waals equation. The Redlich-Kwong equation.