The preexponential and activation energy for the diffusion of iron in cobalt are 1.1 10 -5

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The preexponential and activation energy for the diffusion of iron in cobalt are 1.1 × 10-5 m2/s and 253,300 J/mol, respectively. At what temperature will the diffusion coefficient have a value of 2.1 ×  10-14 m2/s?

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