Steady$-$state, multicomponent, gas$-$phase flux calculation A flat plate of solid carbon is being burned in the presence of pure oxy$-$ gen according to the reaction $2$C$($s$)+\{02($g$)->$ CO$($g$)+$ CO$2($g$)$ Molecular diffusion of gaseous reactant and products takes place through a gas film adjacent to the carbon surface; the thickness of this film is $1\mathrm{.}0$ mm$.$ On the outside of the film, the gas concentration is $40\%$ CO$,20\%$ O$2,$ and $40\%$ CO$2.$ The reaction at the surface may be assumed to be instantaneous; there$-$ fore, next to the carbon surface, there is virtually no oxygen. The temperature of the gas film is $600$ K$,$ and the pressure is $1$ bar. Estimate the rate of com$-$ bustion of the carbon, in kg$/$m$^2-$min, and the interface concentration. Answer: $0\mathrm{.}241$ kg$/$m$2-$min