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An electron tube was sealed off during m...

An electron tube was sealed off during manufacture at a pressure of `1.2xx10^(-7)` mm of mercury at `27^(@)C.` Its volume is 100 `cm^(3)`. The number of molecules that remain in the tube is

A

`6.02xx10^(14)`

B

`8.2xx6.02xx10^(23)`

C

`24.6xx10^(6)`

D

`8.2xx30xx6.02xx10^(23)`

Text Solution

Verified by Experts

The correct Answer is:
A
PV=nRT, `n=(PV)/(RT)=10^(-7)` mol
1 mol =`6.022xx10^(23)` molecule
`:. 10^(-7)` mol =`6.022xx10^(14)` molecule
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