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The rpessure in a bulb dropped from 2000...

The rpessure in a bulb dropped from 2000 to 1500 mm of Hg is 47 min when the contained oxygen leaked through a small hole. The bulb was then evacuated. A mixture of oxygen and another gas off molar mass 79 in the molar ratio of 1:1 at a total pressure of 4000 mm of Hg was introduced. find the molar ratio of two gases remaining in the bulb after a period of 74 min.

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CHHAYA PUBLICATION-STATES OF MATTER : GASES AND LIQUIDS-EXERCISE (NUMBERICAL PROBLEMS)
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  20. The rpessure in a bulb dropped from 2000 to 1500 mm of Hg is 47 min wh...

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