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A flask of volume 1 litre contains vapou...

A flask of volume 1 litre contains vapour of `CH_(3)OH` at a pressure of 1 atm and `25^(@)C`. The flask was then evacuated till the final pressure dropped to `10^(-1)` mm. Find the number of molecules of methyl alcohol left in the flask.

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`3.2 xx 10^(15)`
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