Solve all WITH FULL STEPS , (especially do c and d)

Question 1 Air in a certain area has the following molar composition: N 74.1% 02 15.3% HO 3.2% CO2 6.1% 1.3% Ar a) What is the average molecular mass of the mixture? b) What is the mass composition of the mixture? c) What is the concentration of Argon in ppm? d) If the mixture flows at a rate of 1000 lbmol/hr, what is the mass flow rate of each component in kg/s