11. For the homogeneous reaction A B C → D, the dependence of the concentration of substance A (Ca, mol/m3) on time is given for the initial concentrations of B and C, significantly exceeding the initial concentration of substance A.
Time, min 0 10 20 30 40 50 60 70
Ca, mol/m3 220 174 130 92 61 36 16 5

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