A gas plant processes 140 MMscfd (43.4 Nm3/s) of gas containing 500 ppmv of oxygen. How many lbm (kg) of oxygen go into the plant per day? Some have stated that because helium naturally occurs in the...

A gas plant processes 140 MMscfd (43.4 Nm3/s) of gas containing 500 ppmv of oxygen. How many lbm (kg) of oxygen go into the plant per day?

Some have stated that because helium naturally occurs in the atmosphere there is no reason to consider it a natural resource. Do you agree? Why?