Chapter 9, Problem 86E

During the discussion of gaseous diffusion for enriching uranium, it was claimed that ${}^{235}{\text{UF}}_6$ diffuses 0.4% faster than ${}^{238}{\text{UF}}_6$. Show the calculation that supports this value. The molar mass of ${}^{235}{\text{UF}}_6=235.043930+6\times 18.998403=349.034348$ g/mol, and the molar mass of ${}^{238}{\text{UF}}_6=238.050788+6\times 18.998403=352.241206$ g/mol.