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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.
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.