We all know the need for Oxygen supply to support COVID patients. An oxygen concentrator takes in a feed stream that is air (79 mol% N2, 21 mol% O2) and produces two streams: A high-purity stream of Oxygen that is sent to the patient, and a waste stream that is discarded. We wish to design an oxygen concentrator to produce a 839 grams per minute stream that contains 95mass% oxygen; the rest is N2. This unit recovers 40 % of the oxygen from the feed stream into the high-purity oxygen stream. Calculate the mass flow rate of the total feed (N2+O2) in grams per minute [round to the nearest 1 gram/minute].

Useful info: MW of N2=28 g/mol; O2=32 g/mol; Air=29 g/mol

This relates to the oxygen concentrator problem. Provide the steps that you used to arrive at your answer.