Q. 49

Pure water

Given

Relative humidity= 40%

Initial volume of vapor V1=10cm3=10.

Let saturation vapor pressure be Po

So, initial pressure of vapours= P1=0.4Po

As mentioned in question, final stage comes when vapours start to condense.

When vapor starts to condense, relative humidity becomes 100% and vapor pressure attains the maximum pressure called saturation vapor pressure.

So final pressure of vapor P2=Po

Since the process is isothermal, temperature remains constant throughout. Applying Boyle’s law which states that PV=constant, if temperature is constant.

P1V1=P2V2

the volume of the vapour at which it will start condensing is 410-6m3

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