Current Attempt in Progress

Nitrogen from a gaseous phase is to be diffused into pure iron at $700C.$ If the surface concentration is maintained at $0\mathrm{.}13$ wt

will be the concentration $($in weight percent$)4\mathrm{.}2$ mm from the surface after $6\mathrm{.}6$ h $?$ The diffusion coefficient for nitrogen in iro

$700C$ is $4\mathrm{.}7{10}^{-10}\frac{m^2}{s}.$