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21. H2, O2, N2, and He are enclosed in Identical containers under the similar conditions of pressure and temperature. The gases will have 

a   s a m e   R . M . S   s p e e d                                                             b   s a m e   K . E . k g ( c )   d i f f e r e n t   K . E . m o l e                                                                             d   s a m e   K . E . v o l            

Dear Student,

Equal volume of all gases under same temperature and pressure contains equal number of molecules. i.e., 1 unit volume of all gases contain equal number of molecules under same temperature and pressure.

Also, all gases at a given temperature have the same average kinetic energy. i.e., each molecule possess same energy (3kT/2) at a given temperature.

Therefore, under similar condition of temperature and pressure all gases will have same kinetic energy per unit volume (KE/vol.). Ans (d)


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