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Diffusion Coeffiecient, Calculate Constant

The diffusion coefficient for Cr^+3 in Cr2O3 is 6x10^-15 cm2/s at 727 degrees Celcius and is 1x10^-9 cm2/s at 1400 degrees Celcius. Calculate the constant D0. Use the value of the Gas constant R+1.987 cal/mole.K

a) 0.015 cm2/s
b) 0.055 cm2/s
c) 0.25 cm2/s

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