Elements of
Chemical Reaction Engineering
6th Edition



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Essentials of
Chemical Reaction Engineering
Second Edition

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Chapter 16: Distributions of Residence Times for Chemical Reactors

Additional Homework Problems

WEB-P16-3B

  Gasoline shortages in the United States have produced long lines of motorists at service stations. The table below shows a distribution of the times required to obtain gasoline at 23 Centre County service stations.
     
    (a) What is the average time required?

(b) If you were to ask randomly among those people waiting in line, "How long have you been waiting?", what would be the average of their answers?
     
   

image 13eq48.gif

     
    (c) Can you generalize your results to predict how long you would have to wait to enter a five-story parking garage that has a 4-hour time limit?
(R. L. Kabel, Pennsylvania State University)