A glass tube of volume 112ml. containing...

A glass tube of volume 112ml. containing a gas is partially evacuated till the pressure in it drops to `3.8 xx 10^(-5)` torr at `0^@C`. The number of molecules of the gas remaining in the tube is

`3 x 10^(17)`

`1.5 xx 10^(14)`

`4.5 xx 10^(18)`

`6 xx 10^(18)`

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