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If the rms speed of oxygen molecules at 0°C is 160 m/s, find the rms speed of hydrogen molecules at 0°C.
- 640 m/s
- 40 m/s
- 80 m/s
- 332 m/s
Correct answer: 640 m/s
Solution
At equal temperature v_rms scales as 1/sqrt(M). With M(O2)=32 and M(H2)=2, v_H = v_O*sqrt(32/2) = 160*4 = 640 m/s.
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