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Question

At what temperature, hydrogen molecules will have same average speed as nitrogen molecules at 470C?

A
32.2K
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B
50K
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C
22.86K
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D
14.84K
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Solution

The correct option is B 22.86K
Average speed for gaseous molecule.
Cavg=SRTπM
For N2 , (Cavg)N2 = SRTM2πMN2
For H2 , (Cavg)H2 = SRTH2πMH2
as (Cavg)M2 = (Cavg)H2 (given)
TM2MM2=TH2MH2

320K28 = x2

Hence temperature will be 22.86K



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