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using diffusion constant formula

The flux of POLION through a membrane made of this unknown substance is 5103kg/m2s at 700C. The concentration of POLION through the 0.05cm membrane decreases from 0.65kg/m3 to 0.05kg/m3. This membrane functions at steady state. If the activation energy of the diffusion process of POLION through the unknown substance is 45% larger then the activation energy of vacancy formation, please calculate the diffusion coefficient for POLION at 900C