Aqueous H2O2 decomposes to produce water and oxygen gas.  The rate constant for the reaction is 3.66 X 10-3 sec-1.  A 250.0 mL solution was prepared to be 3.55% by mass H2O2 and the solution's density is 1.09 g/mL. a) How many grams of H2O2 were present initially? b) How many grams of H2O2 would be present after 287 seconds?

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