(40 P) Q3 A mixture of He (A) and Ar(B) at 298K is diffusing through an. open capillary 15mm long with a radius of 1000A. The total pressure is 1.013105Pa. The molecular diffusivity DAB at 1.013105Pa is 7.29105m2/s a. Calculate the Knudsen diffusivity of He(A). b. Predict the flux NA using Eq. (19.4-18) and Eq. (19.4-12) if xA1= 0.8 and xA2=0.2. Assume steady state. c. Predict the flux NA using the approximate Eqs. (19.4-14) and (19.4-16)