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A gas at 300 K has pressure 4 xx 10^(-10...

A gas at 300 K has pressure `4 xx 10^(-10) N//m^(2)`. IF `k = 1.38 xx 10^(-23) J//K`, the number of `"molecule"// cm^(3)` is of the order of

A

100

B

`10^(5)`

C

`10^(8)`

D

`10^(11)`

Text Solution

Verified by Experts

The correct Answer is:
B
As `P=nk_(B)T`, where n = number of molecules per unit volume
`therefore n=(P)/(k_(B)T)=(4xx10^(-10))/(1.38xx10^(-23)xx300)~=10^(11)perm^(3)=10^(5)percm^(3)`
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