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Question

The ratio of the RMS velocities of SO2 and helium gas molecules at 25oC is:

A
4 : 1
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B
1:4
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C
16:1
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D
1 : 16
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Solution

The correct option is A 1:4
Root mean square velocity = 3RTM
For SO2 molecule, M = 64 g/mole
URMS=3×R×T64
For Helium gas molecule, M = 4 g/mole
URMS=3×R×T4
(URMS)SO2(URMS)He=464=14=1:4

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