The gas phase reaction 2A ⇌ B is carried out in an isothermal plug flow reactor. The feed consists of 80 mole % A and 20 mole % inerts. If the conversion of A at the reactor exit is 50%, then CA/CA0 at the outlet of the reactor is _______________________?
Correct answer: B. 5/8
- A. 2/3
- B. 5/8
- C. 1/3
- D. 3/8
Explanation
For 2A ⇌ B, the total moles decrease as A reacts, giving ε = −0.8/2 = −0.4. At X = 0.5, CA/CA0 = (1 − X)/(1 + εX) = 0.5/0.8 = 5/8.
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