A1.00 g sample of a hydrogen peroxide (h2o2) solution is placed in an erlenmeyer flask and diluted with 20 ml of 1 m aqueous sulfuric acid. to this solution is added 0.0200 m kmno4 solution via a buret, until a pale purple color persists. this requires 22.50 ml of kmno4 solution. what is the percent by mass of hydrogen peroxide in the original solution? (a) 0.613% (b) 1.53% (c) 3.83% (d) 7.65%