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Estimate the number of molecules left in...

Estimate the number of molecules left in a volume of the size of a pinhead about 1 cubic mm when the air is pumped out to give a vaccuum of `10^(−6 )`m Hg at `25^oC`.

A

3.2×`10^7`

B

2.2×`10^7`

C

3.2×`10^5`

D

2.2×`10^5`

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