A pressure as low as 1 ✕ 10-8 torr can be achieved using an oil diffusion...
A pressure as low as 1 ✕ 10-8 torr can be achieved using an oil diffusion pump. How many molecules are there in 1 cm3 of a gas at this pressure if its temperature is 318 K?
Homework Answers
Number of molecules can be found out as
n = PV / kT
where k is Boltzmann's constant = 1.38e-23
P = 1e-8 torr
1 torr = 133.322 Pa
so
P = 1.3332e-6 Pa
so,
n = 1.3332e-6 * 1e-6 / 1.38e-23 * 318
n = 3.038e8
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