813. The iodination reaction of β-phenylpropiolic acid C6H5OCCOOH proceeds in the second order (first order for acid and first order for iodine). Below are the results of studying this reaction at 24.8 °C in a solution with equal initial concentrations of iodine and acid (C0 = 0.251 mol/l). Determine the rate constant.

t, min 114 405 662 1388 1780 2790
С, mol/l 0.0213 0.0155 0.0124 0.0079 0.0066 0.0046

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