Posted by Anonymous on .
Uranium235 can be separated from U 238 by fluorinating the uranium to form UF 6 which is a gas) and then taking advantage of the different rates of effusion and diffusion for compounds containing the two isotopes.
Calculate the ratio of effusion rates for 238 UF 6 and 235 UF 6. The atomic mass of U235 is 235.054 amu and that of U238 is 238.051 amu.

Chemistry 
DrBob222,
r1 = rate for U235
r2 = rate for U238
M1 = mass U235 = 235
M2 = mass U238 = 238
(r1/r2) = sqrt(M2/M1)