at room temperature a diatomic is found to have an r.m.s speed of 1930 m/s the gas is;

We know that,
vrms2=3RTMWhere, M =molar massSo, M=3RTvrms2
Now, at room temperature (298 K), R = 8.314 kg m2 s-1
Putting the values we get:

M=3×8.314×298(1930)2=0.002 Kg = 2g 
So, the gas is hydrogen (H2) with molar mass 2 g.

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