At the same temperature and pressure, what do equal numbers of moles of any gas occupy?

At the same temperature and pressure, equal numbers of moles of any gas occupy the same volume due to a fundamental principle known as Avogadro's Law. This law states that equal volumes of gases, at the same temperature and pressure, contain an equal number of molecules or moles.

This principle applies regardless of the type of gas, which is why it holds true for all gaseous substances when the conditions of temperature and pressure are matched. Consequently, if you have, for example, 1 mole of oxygen gas and 1 mole of nitrogen gas, under the same conditions, they will occupy the same volume even though their molecular structures and masses differ.

The other options suggest variability based on gas type, physical state, or molar mass, which contradicts Avogadro's Law. For example, the statement that gases occupy different volumes depending on the gas would imply that there are discrepancies in the basic properties of gases under uniform conditions, which is not the case.