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Chemical Engineering MCQs: 8,342 practice questions with answer choices and available explanations. Page 245 of 557.

Chemical Engineering MCQs

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Pick the WRONG design guideline for a reactor in which the reactions, A → R (desired) and A → S (undesired) are to take place. The ratio of the reaction rates is rR/rS = (k1/k2). CA a-b?

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A.Use CSTR with a high conversion, when a > b
B.Avoid recycle, when a > b
C.Use high pressure and eliminate inerts, when a > b
D.Use batch reactor or plug flow reactor, when a > b
Explanation: The correct answer is Avoid recycle, when a > b.

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At 100°C, water and methylcyclohexane both have vapour pressures of 1 atm. Also at 100°C, the latent heats of vaporisation of these compounds are 40.63 kJ/mole for water and 31.55 kJ/mole for methylcyclohexane. The vapour pressure of water at 150°C is 4.69 atm. At 150°C, the vapour pressure of methylcyclohexane would be expected to be________?

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A.Significantly more than 4.69 atm
B.Significantly less than 4.69 atm
C.Nearly equal to 4.69 atm
D.Indeterminate due to lack of data
Explanation: The correct answer is Significantly more than 4.69 atm.

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