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Calculate the volume of dry air at STP t...

Calculate the volume of dry air at STP that occupies 28 cc at `14^(@) and 750` mm of Hg pressure when saturated with water vapour. The vapour pressure of water at `14^(@)` is 12mm of Hg.

Text Solution

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Actual pressure of gas=total pressure-aqueous tension=total pressure-vapour pressure=(750-12)=738mm `(P_(1))`
`V_(1)=28c c, T_(1)=14^(@)=(14+273)=287K`
`P_(2)=760mm, T_(2)=273K, V_(2)=?`
We have, `(P_(1)V_(1))/(T_(1))=(P_(2)V_(2))/(T_(2)) or, (738times28)/(287)=(760timesV_(2))/(273) or, V_(2)=25.9c c`
So the volume of gas at STP wil be 25.9c c
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