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A flask containing 12 g of a gas relativ...

A flask containing `12 g` of a gas relative molecular mass `120 at` a pressure of `100 atm` was evacuated by means of a pump until the pressure was `0.01 atm`. Which of the following in the best estimate of the number of molecules left in the flask `(N_(0)=6xx10^(23)mol^(-1))`?

A

`6xx10^(19)`

B

`6xx10^(18)`

C

`6xx10^(17)`

D

`6xx10^(13)`

Text Solution

Verified by Experts

The correct Answer is:
B
pV=nRt
`ppropn`
`n_(2)=n_(1)p_(2)/p_1=0.1xx(0.01)/(100)" mol"= 10^(5)`
`:.` Molecules =`N_(o)xx10^(-5)=6.02xx10^18`
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