Carbon dioxide is passed through nitrogen gas at zero temperature. In this system, the mole fraction of carbon dioxide at a point a is $0\mathrm{.}2,$ and at a point b in the direction of diffusion and $3$ m ahead of point a$,$ it is $0\mathrm{.}02.$ under these conditions, the diffusion coefficient of carbon dioxide into nitrogen gas is $0\mathrm{.}144$ cm$^2/$s$.$ Nitrogen gas also diffuses into carbon dioxide in the form of equimolar opposite diffusion. Calculate the molar flux of carbon dioxide in kg$.$moles$/$m$^2$h$.$