1) Three materials are exposed to a carbon-rich atmosphere. In all three cases, the steady-state flux is 2.9x10-9 kg/m?s and the carbon-rich side of the sample has a surface concentration of 1.2 kg/m. Calculate the C concentration on the other side (low-C side) of all three samples, given the following information: Sample A: D = 3x10-11 m/s, total thickness = 8 mm Sample B: D = 3x10-11 m/s, total thickness = 6 mm Sample C: D = 5x10-11 m/s, total thickness = 7 mm