°C. After having reached steady state, the iron was quickly cooled to room temperature. The carbon concentrations at the two surfaces of the sheet were determined to be 0.012 and 0.0075 wt%. Compute the diffusion coefficient if the diffusion flux is 1.4 × 10(2)kg/m²-s. Hint: Use Equation 4.9 to convert the concentrations from weight percent to kilograms of carbon per cubic meter of iron. Draw a cross-sectional schematic of the problem, then superimpose on it the concentration profile.Is it linear? Non-linear? Show your work as you would on an exam: equations in symbols, values of the parameters with units, any unit conversions, final answer with units.

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