posted by mary on .
Air is 20.9% oxygen by volume.How many mL of air contains 175 mL of oxygen?
So lets say we have 100 mL of air then this will contain 20.9 mL oxygen.
Thus 100 mL/20.9 of air will contain
1 mL of oxygen.
So how many mL of air contain 150 mL of oxygen?