Active mass of 5.6 lit nitrogen at STP

For any gas n α V, and at STP GMW occupies 22.4 lit;Example:A) 5.6 lit of Nitrogen at STP ...... 0.25 molesB) 22.4 lit of Oxygen at STP ..... 1 moleC) 11.2 lit of Hydrogen at STP - 0.5 moles