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At a certain temperature this reaction follows second-order kinetics with a

rate constant of 0.0554M:

2H₂PO₂ (aq) → P₂O₂ (aq) + 3H₂O (aq)

Suppose a vessel contains H,PO, at a concentration of 0.390M. Calculate the

concentration of H₂PO4 in the vessel 310. seconds later. You may assume no

other reaction is important.

Round your answer to 2 significant digits.

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