how does the volume of an ideal gas at constant temperature and pressure change as the number of moleculess increeases

Explanation:

This question seeks to test the knowledge of Avogadro's law. Avogadro's law states that equal volume of gases, at constant temperature and pressure,  contain the same number of molecules. The meaning here is that the volume of a given mass of (ideal) gas is directly proportional to the number of molecules. Thus, an increase in volume of an ideal gas will lead to an increase in the number of molecules of the gas. Also, an increase  in the number of molecules of an ideal gas will lead to an increase in the volume of the gas at constant temperature and pressure.