Apply the Gibbs phase rule to the following situations. (5 points each) Part a) An air stream with small amounts of hydrocarbons is to be treated in an adsorption process to reduce the amount of volatile hydrocarbon in the air stream. At the exit of the separation process, the solid sorbent is in equilibrium with a vapor stream that contains air and four hydrocarbons. How many intensive variables need to be specified to reduce the degrees of freedom to zero? You may take air to be one component. Part b) A foam material that contains water is dried in an oven using an inert gas. How many intensive variables need to be specified to reduce the degrees of freedom to zero? A feed to a flash unit consists of four different species. Two streams (liquid and vapor) exit the flash unit and are in equilibrium. The temperature and pressure in the exiting streams are specified. How many more intensive variables need to be specified to reduce the degrees of freedom to zero? Part d) Four components are fed to a flash unit. Three streams (vapor stream, liquid stream 1, and liquid stream 2) exit the flash unit and are in equilibrium. The two exiting liquid streams are partially miscible but form two distinct phases. All components are present in each of the three exiting streams. How many intensive properties need to be specified to reduce the degree of freedom to zero for analyzing this