Calculate the r.m.s velocity of air molecules at S.T.P. Density of air at S.T.P. is 1.29 kg `m^(-3)`

Explanation

To calculate the root mean square (r.m.s) velocity of air molecules at standard temperature and pressure (S.T.P.), we can follow these steps:

### Step 1: Understand the formula for r.m.s velocity
The formula for the r.m.s velocity (Vrms) of gas molecules is given by:
\[ V_{rms} = \sqrt{\frac{3RT}{M}} \]
where:
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