The molar volume of argon gas at standard temperature and pressure (STP)is larger than the molar volume of helium at STP, since the atoms are larger.

Name: The molar volume of argon gas at standard temperature and pressure (STP)is larger than the molar volume of helium at STP, since the atoms are larger.
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Quizplus · Accepted Answer

The molar volume of any ideal gas at STP, including both argon and helium, is approximately 22.4 liters per mole, regardless of the size of its atoms.

The Molar Volume of Argon Gas at Standard Temperature and Pressure