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← ScienceWhich outcome reduces reaction rates when a continuous stirred-tank reactor (CSTR) is subject to significant back-mixing?
A)Broadened residence time distribution✓
B)Increased heat transfer uniformity
C)Enhanced thermal runaway sensitivity
D)Narrowed reactant concentration profile
💡 Explanation
Broadened residence time distributions reduce the rate, because *Dispersion* causes reactants to spend variable durations in the reactor giving non-ideal conversions; therefore the overall reaction rate decreases, rather than increasing it from narrowed concentrations or affecting heat transfer.
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