Mean Free Path: What Is the Mean Free Path of Molecules

Multiple Choice

Mean free path: What is the mean free path of molecules in an ideal gas in which the mean collision time is 3.00 × 10^-10 s, the temperature is 300 K, and the mass of the molecules is 6.00 × 10^-25 kg? Assume that the molecules are moving at their root-mean-square speeds. The Boltzmann constant is 1.38 × 10^-23 J/K.

A) 7.22 × 10^-8 m
B) 4.32 × 10^-8 m
C) 9.19 × 10^-8 m
D) 1.39 × 10^-8 m
E) 6.71 × 10^-8 m