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A jar contains a gas and a few drops of ...

A jar contains a gas and a few drops of water. The pressure in the jar is 830mmof mercury, The temperature of the jar is reduced by 1%. The saturation vapour pressures of water at the two temperatures are 30mm of mercury and 25mm of mercury. Calculate the new pressure in the jar.

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Verified by Experts

Pressure is minimum when the vapour
present inside is at saturation vapour
pressure. As this is the maximum pressure
which the vapour can exert.
Hence the normal level of mercury drops
down by 0.8 cm
:. The height of Hg column
(Given SVP at atmospheric temperature
= 0.08 cm of Hg )
= 76 - 0.80 cm
= 75.2 cm of Hg.
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