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For reaction control in the shrinking core model, the conversion time relation involves

  • A.one less the cube root of the fraction
  • B.the conversion raised to the first power
  • C.the logarithm of the conversion reached
  • D.the square of the conversion reached

Answer: A

The relation follows from the surface area of the shrinking core, which falls with the square of its radius. Plotting the data in that form gives a straight line if reaction controls. Surface area falls with the square of radius.

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