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Find the activated diffusivity of carbon if energy of activation is 6 kJ; the value of constant diffusivity is 2.5 sq.m/sec.  (Hint: the value of exponential of (-6/RT) is 2.55)

(a) 6.375 sq.m/s

(b) 1.02  sq.m/s

(c) 15.3 sq.m/s

(d) 16.25 sq.m/s

The question was posed to me in examination.

This interesting question is from Molecular Diffusion in Solids in section Diffusion in Solids and Molecular Diffusion in Fluids of Mass Transfer

1 Answer

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by (39.8k points)
Correct option is (a) 6.375 sq.m/s

Easy explanation: Activated diffusivity= constant diffusivity * exponential value

                                                             = 2.5 * 2.55

                                                             = 6.375.

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