At a certain temperature this reaction follows first-order kinetics with a rate constant of 3.08s^-1: 2H3PO4(aq)--->P2O5(aq)+3H2O(aq) Suppose a vessel contains H3PO4 at a concentration of 0.830M. Calculate how long it takes for the concentration of H3PO4 to decrease to 0.208M. You may assume no other reaction is important. Round to 2 significant digits.

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