355. Oxidation of FeCl2 in aqueous solution with potassium chlorate KClO3 in the presence of HCl is a third-order reaction. If the time is expressed in minutes, the concentration is expressed in mol/l, the rate constant of this reaction is equal to one. Calculate the concentration of FeCl2 1.5 hours after the start of the reaction, if the initial concentrations of all reactants are 0.2 mol/l.

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