Under what conditions, do molar volumes of different gasees contain equal number of molecules ?

Equal volume of all gases always contains equal number of moles.

Assertion (A) : 22.4 L of nitrogen at S.T.P and 5.6 L of oxygen at S.T.P contain equal number of molecules . Reason (R) : Under similar condition of temperature and pressure all gases contain equal number of molecules .

Name the law in Physics which states that equal volume of all gases under the same conditions of temperature and pressure contain equal numbers of molecules.

Assertion : Equal volumes of all gases under similar conditions of temperature and pressure contain equal number of molecules Reason : Volume of a gas is inversely proportional to pressure