Calculate the mass of H2O2 in a 120 ml solution if 8.12 ml of KMnO4 titrant (W) = 0.034 mol/l is consumed for titration of a 10.0 ml solution. Write: a) reaction scheme; b) factors of equivalence of participants of reaction; c) expression of the law of equivalents for reaction; d) type of chemical reaction (titration method); e) indicator for determination of equivalence point (choice to explac)