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1. A plate of iron is exposed to a carbon-rich environment on one side and carbon-poor on the other. At what location is the concentration equal to 0.7 kg/m3? (20 points) It is exposed for a long time (steady-state) D = 3 10-11 m/s J = 2.4 x 10-9 kg/m2-s C = 1.2 kg/m3 C = 0.7 kg/m 5 mm ? mm