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A gas mixture was prepared at 778 K with total pressure 2.66 atm and a mole fraction of 6.45x10-4 of H2O2 and 3.72x10-4 of H. The elementary reaction H2O2(g) + H(g) ------> HO2(g) + H2(g) has a second order rate constant of 2.02x108 L mol-1 s-1 at this temperature. Calculate the initial rate of the reaction under these conditions.