The elementary, irreversible liquid-phase hydration of butylene oxide produces butylene glycol. The reaction is conducted using water as the solvent, so that water is in large excess. The initial concentration of butylene oxide is 0.25 mol/L. The reaction rate constant is 8.3 x 10-4 L/mol-min at 323 K, the temperature at which this reaction is run: C4H8O + H2O → C4H10O2 . A batch reactor is designed for this system. Determine the final concentration of butylene oxide after 45 min of reaction time.