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For the gas phase decomposition of hydrogen peroxide at 400 degrees C. H2O2(g) → H2O(g) + 1/2 O2(g) is second order in H2O2 with a rate constant of 0.650 M^-1 S^-1 If the initial concentration of H2O2 is 0.245 M, the concentration of H2O2 will be ____ M after 53.5 seconds have passed.