Chemistry and Calculus

Calculus Level 5

The pressure in a bulb dropped from 2000 \displaystyle2000 to 1500 \displaystyle1500 mm of mercury in 47 \displaystyle47 min when the contained oxygen leaked through a small hole. The bulb was then evacuated. A mixture of oxygen and another gas of molecular weight 79 \displaystyle79 in the molar ratio of 1 : 1 \displaystyle 1:1 at a total pressure of 4000 \displaystyle 4000 mm of mercury was introduced.

What is the molar ratio of the two gases remaining in the bulb after a period of 74 \displaystyle 74 min?


The answer is 1.18.

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