Please answer my questions

Q 1 NA is given, NB is zero, CA and CB are given NA=cAVA, to calculate individual velocities Finally calculate average velocity Q.2 Assume dilute solution Calculate xA Calculate cA Q. 3 Calculate all variables in Hirschfelder equation and solve. Q. 4 a) Use Hirschfelder equation b) Calculate DAC, and use DAB from part a and use gas mixture equation Q. 5 a) calculate c,cA and A b) Estimate DAB(H2S in N2) using Hirschfelder equation c) Estimate DAC(H2S in SO2) using Hirschfelder equation Use gas mixture equation