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What is the meaning of "take ca. 30 min" in this sentence: The reactions with diethylamine and benzylamine are moderately exothermic and take ca. 30 min"?
Accepted Answer
In the sentence "The reactions with diethylamine and benzylamine are moderately exothermic and take ca. 30 min", "ca. 30 min" refers to the approximate time required for the reaction to complete. The "ca." is an abbreviation for "circa", meaning 'around' or 'approximately'. So, the reaction takes roughly 30 minutes.
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