In the presence of excess thiocyanate ion, SCN-, the following  reaction is first order in chromium(III) ion, Cr3+  Cr3+(aq) + SCN(aq)  →  Cr(SCN)2+(aq) The rate constant for the reaction is 2.0x10-6/s. How many hours would it take for the concentration of Cr3+ to decrease to 12.5% of its initial concentration? Express your answer to one decimal place.

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