11. Determine after what period of time after the start of the second-order reaction the concentrations of the reactants will decrease by 2 times if their initial concentrations are equal. The values of the reaction rate constant (K) and the initial concentration of substances (Co) are shown in Table 2.

option number K*103, mol/l*s C0, mol/l
11 8.5 2.8

When solving this task, pay attention to the fact that there are two different kinetic equations for second-order reactions, depending on the values of the initial concentrations of the reactants. The value of K given in the table must be multiplied by 10-3.

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