Answer part b question 1 and part aquestion 2

b) A steel rectangular container having walls 16 mm thick is used to store gaseous hydrogen at elevated pressure. The molar concentrations of hydrogen in the steel at the inside and outside surfaces are 1.2kgmole/mland zero respectively. Assuming the diffusion coefficient for hydrogen in steel as 0.248 *10 m/s. calculate the molar diffusion flux for hydrogen through the steel (3 Marks) 2. a) As an engineer, there are four major membrane processes. List and briefly describe the membrane processes, comparing and contrasting, where possible. Give instances for the application of each process (12 Marks) b) Discuss the different geometries of reverse osmosis membranes (6 Marks)