Problem: Assuming ideal behavior, which of these gas samples has the greatest volume at STP?(a) 1 g of H2(b) 1 g of O2(c) 1 g of Ar

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We are asked which of the gas samples has the greatest volume at STP.


The molar volume is the same (22.4 L) for every ideal gas. 

  • The given masses are the same.
  • This means the lowest molar mass will have the highest volume.


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Problem Details

Assuming ideal behavior, which of these gas samples has the greatest volume at STP?
(a) 1 g of H2
(b) 1 g of O2
(c) 1 g of Ar

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