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In a very good vacuum system in the labo...

In a very good vacuum system in the laboratory, the vacuum attained was `10^-13 atm`. If the temperature of the system was `300 K`, the number of molecules present in a volume of `1 cm^3` is.

A

`2.4 xx10^6`

B

`24`

C

`2.4 xx10^9`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
A
`PV = nRT " "rArr" "10^(-3) xx10^(-3) C - atm = n (0.0821)(300) rArr n = 10^(-16)/(24.63)`
`N = nxxN_A = 10^(-16)/(24.63) xx6.023 xx10^(23) = 0.244 xx10^7 = 2.44 xx10^6`
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