What is the volume of 4.80 � 1022 molecules of nitrous oxide gas, N2O, at STP?

divide by Avogadro's number to get moles then use the ideal gas law PV=nRT STP means pressure is 1 atm Temperature is 273 k and R is .082 sooo PV=nRT is 1V=n(.082)273 and your n is the 4.80 x 10^22 divided by 6.022 X 10^23