First slide

Rms speed

Question

The molecular weights of oxygen and hydrogen are 32 and 2 respectively. The root mean square velocities of oxygen and hydrogen at NTP are in the ratio

Moderate

A

4 : 1
B

1 : 16
C

16 : 1
D

1 : 4

Solution

$R M S s p e e d C \infty \frac{1}{M} \Rightarrow \frac{C_{O_{2}}}{C_{H_{2}}} = \sqrt{\frac{2}{32}} = \frac{1}{4}$

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