The number of mole of oxygen in one litre of acontaining 21% oxygen by volume, under standardconditions, is?

The number of mole of oxygen in one litre of acontaining 21% oxygen by

1.	The number of mole of oxygen in one litre of acontaining 21% oxygen by volume, under standardconditions, is?
Answer» Under standard conditions ONE mole of any SUBSTANCE occupy 22.4dm3 or 1 LITER VOLUME. So there will be only one mole of oxygen in 1 liter volume at STP