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Q.

The pressure in a vessel that contained pure oxygen dropped from 2000 torr' to 1500 torr in 40 min as the oxygen leaked through a small hole into a vacuum. When the same vessel was filled with another gas. the pressure dropped from 2000 torr to 1500 torr in 80 min. What is the molecular weight of the second gas?

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answer is 128.

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Detailed Solution

The molecular weight can be given as,

$\frac{\frac{(2000 - 1500)}{40}}{\frac{(2000 - 1500)}{80}} = \sqrt{\frac{M}{32}} \Rightarrow M = 128$

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