Current Attempt in Progress

It has been determined that the steady$-$state diffusion flux of nitrogen through a steel plate is $1\mathrm{.}5{10}^{-8}k\frac{g}{m^2}*s$ at a temperature of

$1300K(1027C),$ and for a concentration gradient of $-300k\frac{g}{m^4}.$ What concentration gradient is necessary to give a diffusion flux of

$4\mathrm{.}0{10}^{-8}k\frac{g}{m^2}*s$ at $1370K(1097C)$ if the activation energy for diffusion is $124,000\frac{J}{m}ol?$

$\frac{C}{}x=$