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A volume of 10 ml of ethane gas is mixed with 40 ml of Oxygen gas in an eudiometer tube at 30°C and fired. When the resulting gases are cooled to 30°C, the volume in eudiometer becomes 26 ml. What is the vapour pressure of water (in mm of Hg) at 30°C? Neglect the volume occupied by liquid water. Pressure is 760 mm of Hg and constant throughout.

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answer is 29.23.

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Detailed Solution

$C_{2} H_{6} + \frac{7}{2} O_{2} \to 2 C O_{2} + 3 H_{2} O$

Final value of all gaseous components after the reaction except water =25 ml

$∴$ volume of $H_{2} O$ in vapour phase =1 ml

Partial pressure of water vapour $= \frac{1}{26} \times 760 = 29.23 m m o f H g$

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