3. The reaction of disproportionation of hypobromite ions 3BrO– → BrO3– + 2Br– in an alkaline medium is described by a second-order kinetic reaction equation with a rate constant of 9.3•10–4 m3•kmol–1•s–1. The initial concentration of hypobromite ions is 0.1 kmol/m3. How long will it take for 30% of the initial amount of hypobromite ions to react?

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