3 MnO2 (s) → O2 (g) + Mn3O4 (s)

This is an oxidation-reduction (redox) reaction:

3 MnIV + 4 e- → 3 Mn8/3 (reduction)

2 O-II - 4 e- → 2 O0 (oxidation)

MnO2 is an oxidizing agent, MnO2 is a reducing agent.

Reactants:

  • MnO2 – Manganese oxide source: wikipedia, accessed: 2019-09-27, Manganese(IV) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Manganese dioxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Pyrolusite source: wikipedia, accessed: 2019-09-27, Hyperoxide of manganese source: wikipedia, accessed: 2019-09-27
    • Appearance: Brown-black solid source: wikipedia, accessed: 2019-09-27; Black-to-brown powder source: ICSC, accessed: 2019-09-04

Products:

  • O2
    • Names: Dioxygen source: wikidata, accessed: 2019-09-07, Oxygen source: ICSC, accessed: 2019-09-04source: wikidata, accessed: 2019-09-07, Oxygen (liquefied) source: ICSC, accessed: 2019-09-04
    • Appearance: Odourless compressed gas source: ICSC, accessed: 2019-09-04; Liquefied gas. colourless-to-blue extremely cold liquid source: ICSC, accessed: 2019-09-04
  • Mn3O4 – Manganese(II) dimanganese(III) oxide source: wikipedia, accessed: 2019-09-27
    • Other names: Manganese(II,III) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Manganese tetroxide; Manganese oxide source: wikipedia, accessed: 2019-09-27, Manganomanganic oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04source: NIOSH NPG, accessed: 2019-09-02
    • Appearance: Brownish-black powder source: wikipedia, accessed: 2019-09-27; Brown-to-black crystalline powder source: ICSC, accessed: 2019-09-04; Brownish-black powder. [Note: Fumes are generated whenever manganese oxides are heated strongly in air.] source: NIOSH NPG, accessed: 2019-09-02