How do you solve this chemistry equation using Avogadro's Law?

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1Oᴄᴀᴎᴇ ④①⑤

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Avogadro's number: 6.02 x 10^23 atoms per mole per liter of substance.

1.8 moles of gas present x 6.02 x 10^23 atoms per mole x 7.2 L of volume = total number of atoms present. Subtract 1/3 of this number and you're left with the total number of atoms present at end.
 
A gas sample containing 1.80 moles of helium gas has a volume of 7.20 L. If the temperature and pressure of the gas sample are constant, then what will be the volume of the gas sample if one third of the neon atoms are allowed to escape?
 
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