7. The oxidation of FeCl2 with KClO3 in the presence of HCl proceeds as a third-order reaction. The reaction rate constant at 295K is 1 min-1*l2/mol2. Calculate the concentration of ferric chloride 1.5 hours after the start of the reaction, if the initial concentrations of substances are the same and equal to 0.2 mol/l.

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