How do I calculate the number of collisions per unit area in an ideal gas?

[aaaa202]

I an ideal gas how do I calculate the number of collision per unit area? By collision I do not mean collision between the atoms but rather it is a problem where I know that a nucleation cluster of area A is in my gas, and I want to find the probability that it will get hit by an atom. I know the temperature, volume, pressure etc and I know that the molecule velocities are distributed according to the maxwell distribution.

 

[DrClaude]

Look at the section on molecular flux: http://www.lehman.edu/faculty/dgaranin/Statistical_Thermodynamics/Molecular_theory.pdf