What volume do 3.8 x 10^22 molecules of NO2 gas occupy at STP?

Answer 1

1 mole will contain 6.022E23 molecules and occupy 22.4 L at STP. How many moles do you have?
3.8E22/6.022E23 = ??
?? moles x 22.4 L/mole = xx L.