When -iron is subjected to an atmosphere of nitrogen gas, the concentration of nitrogen in the iron,

When α-iron is subjected to an atmosphere of nitrogen gas, the concentration of nitrogen in the iron, CN (in weight percent), is a function of hydrogen pressure, pN2 (in MPa), and absolute temperature (T) according to

(5.14)

Furthermore, the values of D0 and Qd for this diffusion system are 5.0 × 10-7 m2/s and 77,000 J/mol, respectively. Consider a thin iron membrane 1.5-mm thick that is at 300°C. Compute the diffusion flux through this membrane if the nitrogen pressure on one side of the membrane is 0.10 MPa (0.99 atm) and that on the other side is 5.0 MPa (49.3 atm)?

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37,600 Jimol Cy = 4.90 x 10 PN, exp| RT