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**[SOLVED] collisions of molecules..**

## Homework Statement

a 10cm^3 box contains nitrogen at 20degreeC. What is the rate of collisions on one wal of he box.

## Homework Equations

kb=1.38x10^-23

1u=1.661x10^-27

molecular mass of N2=28u

avagadros number=6.02x10^23mol^-1

vrms=sqrt((3kbT/m))

rate of collisions=(1/2)(N/V)Av

## The Attempt at a Solution

omg i got no idea where even start with this one... im pretty sure i could do it if they gave me the mass of the gas or the number of molecules...... but im just stuck.... y do they give me avagdros number????? im srry im just really confused bout this one... anyone plz help??