Discussion
Consider the following statements about mixtures of particle sizes.
1. Small particles convert completely before large ones.
2. The overall conversion is a weighted average over the size distribution.
3. The mean size alone is enough to predict the overall conversion.
Answer: B
The first two are correct. The third is wrong, since the relation between time and size is non-linear and using the mean size gives a systematically wrong answer. The distribution must be integrated. Small particles finish long before large ones.
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