Calculate the relative rates of diffusion of  235UF6 and 238UF6 in the gaseous form (F = 19).

Let rate of diffusion of 235UF6=r1 235UF6=235+(6×19)=349g∣mol− rate of diffusion of of  238UF6=r2mol. wt. of  238UF6=238+(6×19)=352gmol−r1r2=M2M11/2;r1r2=3523491/2=(1.0086)1/2=1.00431∴ Ratio of r1 and r2 is : r1:r2::1.0043:1