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Three equal CSTRs in series each give 50 per cent conversion of what enters them. What is the overall conversion?

  • A.150 per cent
  • B.50 per cent
  • C.75 per cent
  • D.87.5 per cent

Answer: D

Each tank leaves half, so one eighth survives all three. Conversions multiply as fractions remaining rather than adding, which is the point the question makes. One eighth survives all three stages. Adding conversions gives an impossible answer.

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