A glass tube of volume 112ml. containing a gas is partially evacuated till the pressure in it drops to 3.8 x 10-5 torr at 0ºC. The number of molecules of the gas remaining in the tube is

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3×1017

1.5×1014

4.5×1018

6×1018

answer is B.

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Detailed Solution

n=PVRT=3.8×10-5×112×10-3760×0.0821×273=2.5×10-10 Number of molecules =2.5×10-10×6.023×1023=1.5×1014

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