1. Helium and nitrogen gases are contained in a conduit 5 mm in diameter and 0.1 m long at 298 K and a uniform constant pressure of 1.0 atm. The partial pressure of He at one end of the tube is 0.060 atm and 0.020 atm at the other end. The diffusivity can be obtained from Table 6.2-1. Calculate the following for steady-state equimolar counterdiffusion: (a) Flux of He in kg mol/s.m². (b) Flux of N2. (c) Partial pressure of He at a point 0.05 m from either end.