You are designing a new air purifier designed to filter out aerosol droplets and particles. The filter is 100 um thick and contains a set of disordered pores with a pore radius of 0.52 um, a tortuosity of 4.3, and a porosity of 0.54. You are using a mixture of helium (MW = 4.00) and nitrogen (MW = 14.01) to test the filter. Determine the flux of helium through this filter at 25 C and 1 atm total pressure if Pa = 0.050 atm and PAz = 0.020 atm. Das = 0.678 cm/s for helium in nitrogen at 25 C and 1 otm