1. The problem statement, all variables and given/known data Suppose we make a circular hole 4 millimeter in diameter in a balloon. Calculate the initial rate at which oxygen escapes through the hole (at 0° C), in number of helium atoms leaving the balloon per second. 2. Relevant equations # of molecules/second =(1/4) (Number of molecules/Volume)A(average velocity) 3. The attempt at a solution Number of molecules - 6.02e23 Volume = .0224 m^3 A=pi*r^2=pi*(.002)^2=1.2566e-5 v=sqrt(3kT/m)=sqrt((3*1.38e-23*273.15)/(16/6.02e23))=425.479 (1/4)(N/V)Av=3.59e22 atoms/s I did this, but it was wrong, any ideas?