Pressure in a bulb dropped from 2000 to 1500 mm in 50 minute when the contained oxygen leaked through a small hole. The bulb was then completely evacuated. A mixture of oxygen and another gas of molecular weight 72 in molar ratio 1:1 at a total pressure of 600 mm was introduced. Find the molar ratio of two gases remaining in the bulb after a period of 70 minute. If your answer is x then fill your OMR with 46 x. (Exclude decimal Place)

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answer is 39.

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Detailed Solution

In $(\frac{2000}{1500}) = \frac{k \times 50}{\sqrt{32}}$

In $(\frac{3000}{x}) = k \times \frac{70}{\sqrt{32}}$

$\Rightarrow x = 2000$

$\begin{array}{l} \frac{3000 - 2000}{3000 - P} = \sqrt{\frac{72}{32}} \\ P = 2333.33 \end{array}$

Molar ratio $= \frac{2000}{2333.33} = x$

$46 x ≃ 39$

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