Introduction to Ideal Gasses Video Lessons

Concept

# Problem: Even the best vacuum pumps cannot lower the pressure in a container below 10−15atm.How many molecules of air are left in each cubic centimeter in this "vacuum?" Assume that the temperature is 283 K.Answer: ________ molecules/cm3

###### FREE Expert Solution

The ideal gas equation:

$\overline{){\mathbf{P}}{\mathbf{V}}{\mathbf{=}}{\mathbf{n}}{\mathbf{R}}{\mathbf{T}}}$

We're told that the pressure in a container cannot be lowered below 10-15 atm.

V = 1 cm3 = 0.001 liter

The ideal gas constant, R = 0.0821.

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###### Problem Details

Even the best vacuum pumps cannot lower the pressure in a container below 10−15atm.

How many molecules of air are left in each cubic centimeter in this "vacuum?" Assume that the temperature is 283 K.