The vapour pressure of water is 17.5 tor...

The vapour pressure of water is 17.5 torr at `20^@C`. When the relative humidity is 45%, the number of moles, of water present at `20^@C` in 1 L of air is

`1.04xx10^(-3)`

`2.43xx10^(-3)`

`4.30xx10^(-4)`

`5.12xx10^(-4)`

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