Write a balanced equation for the reaction by which hydrogen peroxide turns into water as it oxidizes Mn2+ To MnO2 in an acid solution

What is the assigned oxidation number for molybdenum in aluminum molybdate Al2(MoO4)3? +2 +7 +3 +6

Write the two half reactions for the redox reaction between copper metal and nitric acid and give the overall net ionic equation. (Assume the nitric acid is reduced to nitrogen dioxide in the reaction.)

A sample of steel was dissolved and the manganese present was converted to MnO4– (aq). Water was then added to give a final solution volume of 100.00 mL. A sample of this solution was examined and was found to have an absorbance at 525 nm of 0.560 (pathlength = exactly 1 cm). What is the concentration of MnO4– in the solution? (The molar absorptivity is 3.62 × 103 L/(mol cm).)