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A flask of volume 1 litre contains vapou...

A flask of volume 1 litre contains vapour of `CH_3OH `at a pressure of 1 atm and `25^oC`. The flask was then evacuated till the final pressure dropped to `10^(−4)`mm. Find the number of molecules of methyl alcohol left in the flask.

A

2.24×`10^15`

B

2.24×`10^12`

C

4.24×`10^15`

D

3.24×`10^15`

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