A gas mixture of hydrogen and ethane is to be partially separated with a membrane having 1m thickness porous skin with an average pore size of 2nm and a porosity of 0.3. The tortuosity can be assumed to be 1.5. The pressure on either side of the membrane is 1.0 atm and the temperature is 100 C. Estimate the permeability of the two components. (Assume both molecular and Knudsen diffusions of gas mixture take place in the porous membrane