1.10 The reaction H3CO3 H2O2 → 5HCOOH H2O is second order. When mixing equal volumes of H2O2 solution (C=1 mol/l) and formic aldehyde at the same concentration, after 2 hours the concentration of formic acid becomes 0.215 mol/l. Calculate the reaction rate constant, determine the time during which half of the initial substances will react.

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