MEDIUMMCQ SINGLEJEE Mains ChemistryPhysical ChemistryGaseous statePrevious Year Questions

The RMS speed of helium in ms-1 (atomic mass = 4.0 g mol-1) at 400 K is (EAMCET 2014)

A.15.8

B.50

C.158

D.1580✓ Correct

Explanation

Given, T = 400 K Molar mass of helium = 0.004 kg / mol R = 8.314 JK-1 mol-1 (Gas constant) 3 3 3 8.314 400 1579.3 / 1580 / (4 10 ) rms RT V m s m s M kg x x x

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