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Solution :

All the three vessels (at the same temperature and pressure) have same volume. So in accordance with the avagadro.s law, the three vessels will contain equal number of respective molecules, being equal to <br> Avagadro.s number `N=6.023xx10^(23)` <br> As `v_("rms")=sqrt((3kT)/(m))` <br> i.e., `v_("rms")alpha(1)/(sqrt(m))` at a given temp. therefore, rms speed of molecules will not be same in the three cases. <br> As neon has the smallest mass, therefore, rms speed will be largest in case of neon.