alleryStart learning →One mole of an ideal gas at STP occupies approximately what volume?
A22.4 L
B24.8 L
C11.2 L
D44.8 L
Answer & Solution
Correct answer: A. 22.4 L
1. At STP the conditions are 273.15 K and 1 atm.
2. Putting one mole into PV = nRT gives a volume of about 22.4 litres.
3. This figure is called the standard molar volume, and it is the same for any gas behaving ideally.
4. So one mole of helium and one mole of oxygen fill the same 22.4 litres at STP even though their masses differ sharply.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.2 Relating Pressure, Volume, Amount, and Temperature: The Ideal Gas Law_
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