Question

Which statement is true about 22.4 L each of hydrogen sulfide, oxygen, and uranium dioxide gas assuming that the temperature and pressure are the same for all the gases?

Responses

The gases have the same number of molecules.

The gases have the same number of molecules.

Uranium dioxide gas has the least number of molecules.
Uranium dioxide gas has the least number of molecules.

Oxygen gas has the most number of molecules.

Oxygen gas has the most number of molecules.

Hydrogen sulfide gas has three times the number of molecules as oxygen gas.

Answer 1

The gases have the same number of molecules.

Reason: By Avogadro's law, equal volumes of gases at the same temperature and pressure contain equal numbers of moles (22.4 L ≈ 1 mol at STP), so each sample contains the same number of molecules (Avogadro's number).