ANSWER:
Average velocity of the molecules
where
then,
Mean free path of CO2 molecules
where
where R = gas constant = 0.082 atm.L/mol.K, T = temperature of gas = 298 K and P = Pressure of gas = 1 atm
transforming L in m3:
then the mean free path is,
Total number of collisions of CO2 molecules
where
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