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Modern vacuum pumps make it easy to attain pressures of the order of 10−13atm in the...

Modern vacuum pumps make it easy to attain pressures of the order of 10−13atm in the laboratory.

A. At a pressure of 7.10×10−14 atm and an ordinary temperature of 297.0 K , how many molecules are present in a volume of 1.03 cm3 ?

B. How many molecules would be present at the same temperature but at 1.02 atm instead?

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