Discussion
Arrange the resistances of a shrinking core reaction in the order the fluid encounters them.
1. the surface of the unreacted core
2. the gas film around the particle
3. the reverse journey of the product
4. the layer of product ash
Answer: D
The fluid must cross each of them in turn, and any one can dominate the overall rate. Identifying which one does is the whole of understanding the kinetics, and the order cannot be rearranged since each resistance lies physically inside the one before it.
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