alleryStart learning →For a confined gas at constant pressure and temperature, volume is directly proportional to which quantity?
AThe pressure of the gas
BThe mass of one molecule
CThe kelvin temperature
DThe number of moles
Answer & Solution
Correct answer: D. The number of moles
1. Avogadro's law fixes pressure and temperature and lets the amount of gas vary.
2. Under those conditions the volume rises in direct proportion to the number of moles.
3. Adding more breaths to a balloon at the same temperature and pressure swells it proportionally, which is this law in action.
4. Kelvin temperature is held constant in this law, so it cannot be the quantity the volume is tracking.
_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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