Question

The proposition 'equal volumes of different gases contain equal numbers of molecules at the same temperature and pressure' is known as _____.

• A. Avogadro's hypothesis
• B. Gay-Lussac's hypothesis
• C. Planck's hypothesis
• D. Kirchhoff's theory

Answer 1

Answer: (A)

Avogadro's hypothesis

Avogadro's law states that, "equal volumes of all gases, at the same temperature and pressure, have the same number of molecules." i.e, for a given mass of an ideal gas, the volume $V$ is directly proportional to the amount (moles) of the gas $n$ if the temperature and pressure are constant.