In an experimental apparatus used to study combustion, an enriched air mixture is

needed. This mixture consists of $41\mathrm{.}2$ mole $\%$ oxygen and the remainder nitrogen.

Two streams are mixed to form the enriched air mixture. The first stream is ordinary air

at atmospheric pressure, consisting of $21$ mole $\%$ oxygen and the remainder nitrogen. The

second stream is pure oxygen supplied by a gas cylinder, at a pressure of $1500$kPa

absolute$.$

Both the ordinary air and the oxygen are supplied at $20C.$ The desired flow rate of

enriched air is $2\mathrm{.}15\frac{L}{m}in$ at $20C$ and atmospheric pressure. What volumetric flow rate

of pure oxygen at $1500$kPa absolute and $20C$ should be supplied?