Which of the following gas samples would have the largest volume, if all samples are at the same temperature and pressure?

Question

3.01 moles CH4
41.9 grams of Kr
9×1023 molecules of O2
they would all have the same volume

Answer 1

They would all have the same volume. According to Avogadro's Law, equal volumes of gases at the same temperature and pressure contain the same number of molecules regardless of the identities of the gases. Therefore, the number of moles, mass, or molecules of the gas does not affect the volume.