The following reaction has rate law r = k[C4H6] 2 , where k = 0.014 M-1 s -1 What is the concentration of C4H6 (in M) after 3.0 hours, if [C4H6]o = 0.025 M? A. 0.0052 M B. 0.024 M C. 0.012 M D. 0.0060 M

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