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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 xx 10^6`

B

`24`

C

`2.4 xx 10^9`

D

zero

Text Solution

Verified by Experts

The correct Answer is:
A
`n = (p V)/(R T)`
`:. N = n N_A = (p V N_A)/(R T)`
= `((1.013 xx 10^5 xx 10^-13)(10^-6)(6.02 xx 10^23))/((8.31)(300))`
= `2.4 xx 10^6`.
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