A sheet of Fe 1.0 mm thick is exposed to an oxidizing gas on one side and a deoxidizing gas on the other at 725°C. After reaching steady state, the Fe membrane is exposed to room temperature, and the C concentrations at each side of the membrane are 0.012 and 0.075 wt%. Calculate the diffusion coefficient (m2/sec) if the diffusion flux is 1.4×10-8kg/m2-sec.

• A. 9.87*10-12
• B. 9.87*10-13
• C. if the diffusion flux is 1.4×10-8kg/m2-sec.a) 9.87*10-12b) 9.87*10-13c) 9.87*10-11
• D. 9.87*10-10