How many moles of ethylene (C2H4) gas occupy a volume of 3.25 L at STP?
Well, one mole (1 mole) occupies 22.4 L @ STP.
3.25 L C2H4 x (1 mol/22.4 L) = ? mol
Post your work if you get stuck.
3.25 L C2H4 x (1 mol/22.4 L) = ? mol
Post your work if you get stuck.