Hi! Priyanshu,
Rms speed of a gas is given by the formula:
μ rms = (3RT/M) ½
As you have asked for calculating rms speed at STPtherefore, temperature =298K,Molecular mass=28/1000 kg /mol. Now, you can calculate by using above formula. Keeping in mind that rms depends only on temperature.
Good luck!
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