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  4. The root mean square speeds at STP for the gases H2,N2,O2 and HBr are in the order

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Q. The root mean square speeds at STP for the gases $H_2,N_2,O_2$ and HBr are in the order

AIPMTAIPMT 1991States of Matter

Solution:

The root mean square velocity of gas molecule at
STP is given by
$ U_{\text{rms}}=\sqrt{\frac{3RT}{M}}$
$\therefore $ As the molar mass of gas increases, then $U_{\text{rms}}$
will decrease, so the order of $U_{\text{rms}}$ of these gases is
$HBr < O_2 < N_2 < H_2$