alleryStart learning →Equal volumes of all gases at the same temperature and pressure contain what in common?
AThe same number of molecules
BThe same mass of gas in grams
CThe same total kinetic energy
DThe same number of atoms
Answer & Solution
Correct answer: A. The same number of molecules
1. Amedeo Avogadro advanced this hypothesis in 1811 and experiment has supported it ever since.
2. Equal volumes at matched temperature and pressure hold equal numbers of molecules, whatever the gas.
3. The masses differ, because different gases have different molar masses, so equal mass is wrong.
4. The number of atoms differs too, since one molecule may carry one atom or five, so only the molecule count matches.
_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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