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CGP EDU Academic Team
Published on: August 14, 2026
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 ?
Text Solution
Verified by ExpertsThe correct answer is:
CHECK THE SOLUTION.
(M = 128 g/mol)
Change in pressure = 2000-1500 = 500 torr; time-taken = 40 min
rate 1 = 
torr/min; similarly rate 2 = 
torr/min
= 
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