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WAEC Chemistry 2012 Paper

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Question : 26

Total: 44

Which of the following gases has the lowest rate of diffusion under the same condition? [H = 1.00; He = 4. 00; O = 16.0; CI = 35.5]

CI₂
H₂
He
O₂

Solution:

According to Graham's law of diffusion and effusion,

r $\propto$ $\sqrt{\;\frac{1}{M}}$ .

Therefore, the more the molar mass, the less the rate of diffusion and effusion.

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