Q. 12

The quantity <spa A. mass of the gas

B. kinetic energy of the gas

C. number of moles of the gas

D. number of molecules in the gas.

Answer :

We know that ideal gas equation is


PV=nRT


Where V= volume of gas


R=gas constant


T=temperature


n=number of moles of gas


P=pressure of gas.


Gas constant R=kNA


Where k=Boltzmann constant


NA=Avogadro number


So, we can ideal gas equation as


PV=nkNAT



Now, we know that


n=number of molecules of gas ……(ii)


Therefore, from equation (i) and (ii)


Number of molecules of gas=

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