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## Homework Statement

Hi, Im not sure about the following question:

(Q) Argon (atomic weight 40) exists as a monatomic gas at room temperature and pressure. The density of liquid argon is 1784kg/m^3.

(a) Calculate the atomic density (atoms/m^3) in liquid argon *Done*

(b) Hence assumming the packing fraction in liquid argon is 0.7, determine the radius of an argon atom. *Done*

(c) calculate the atomic density in gaseous argon at a pressure of 1atm and a temperature of 300K *Done*

(d) hence calculate the mean free path of an argon atom at a pressure of 1 atm and a temperature of 300K?

## Homework Equations

It is part (d) which I'm having trouble with

The mean free path formula is 1/[(4pi)nσ²]

## The Attempt at a Solution

For part (d) which 'n' should I use the one for gas argon or for liquid argon, the question given doesnt seem to state which mean free path to calculate?