Discussion
Consider the following statements about the E curve.
1. Its area is unity by definition.
2. Its first moment is the mean residence time.
3. Its height at a given time is the conversion at that time.
Answer: A
The first two are correct and define how the curve is used. The third confuses a flow property with a chemical one, since the curve says nothing about what reacted while the fluid was inside. Its area is normalised to unity.
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