Consider the quantity MkT/pV of an ideal gas where M is the mass of the gas. It depends on the

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nature of the gas. 	ext { In an ideal gas, the equation of state is given by } PV = nRT \Rightarrow PV = n N_A R/N_AT \Rightarrow PV = n N_A kT \Rightarrow 1/n N_A = kT/PV 	ext { Multiplying both sides by mass of the gas M, we get } M/n N_A = MkT/PV 	ext { Now, n N_A gives the total number of molecules of the gas . } 	ext { Also }, M/n N_A 	ext{ gives the mass of a single molecule }. 	ext { Hence, }MkT/PV 	ext { is the mass of a single molecule of the gas, } 	ext { Molecular mass is a property of the gas .}

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