Sucrose, C₁₂H₂₂O₁₁, Reacts Slowly with Water in the Presence of an Acid

Sucrose, C₁₂H₂₂O₁₁, reacts slowly with water in the presence of an acid to form two other sugars, glucose and fructose, both of which have the same molecular formulas, but different structures.
C₁₂H₂₂O₁₁ + H₂O  C₆H₁₂O₆ (glucose)+ C₆H₁₂O₆ (fructose)
The reaction is first order and has a rate constant of 6.2  10^-5 /s at 35°C when the H⁺ concentration is 0.10 M.Suppose that the initial concentration of sucrose in the solution is 0.40 M. How many minutes will it take for the sucrose concentration to drop to 0.30 M?

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