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The molar flux of an interstitial solute in a solid is 0.021 mol mm -2 s -1 from a concentration gradient of -0.443 mol mm

The molar flux of an interstitial solute in a solid is 0.021 mol mm-2 s-1 from a concentration gradient of -0.443 mol mm-4. What is the proportionality constant Do of the material (in mm2 s-1), if the activation energy is 53.104 J mol-1 and the temperature is 354.208 K?

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