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Question

The root mean square velocity of helium molecules at NTP will be :


A
0.5 x 105 m/s
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B
1.3 x 103 m/s
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C
1.5 x 106 m/s
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D
1.5 x 107 m/s
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Solution

The correct option is B 1.3 x 103 m/s
NTP condition : T=298 K M=0.004 kg/mol
Root mean square velocity Vrms=3RTM

Vrms=3(8.314)(298)0.004=1.36×103 m/s

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