5 N2O4 + 2 HMnO4 + 2 H2O → 2 Mn(NO3)2 + 6 HNO3

This is an oxidation-reduction (redox) reaction:

2 MnVII + 10 e- → 2 MnII (reduction)

10 NIV - 10 e- → 10 NV (oxidation)

HMnO4 is an oxidizing agent, N2O4 is a reducing agent.

Reactants:

  • N2O4 – Dinitrogen tetraoxide source: wikipedia, accessed: 2019-09-27
    • Other names: Dinitrogen tetroxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, [N(NO2)O2] source: wikidata, accessed: 2019-09-02, Nitrogen tetroxide source: wikidata, accessed: 2019-09-02
    • Appearance: Colourless liquid, orange gas source: wikipedia, accessed: 2019-09-27
  • HMnO4
    • Names: Permanganic acid source: wikidata, accessed: 2019-09-02, Manganic(VII) acid source: wikidata, accessed: 2019-09-02, HMnO4 source: wikidata, accessed: 2019-09-02, [MnO3(OH)] source: wikidata, accessed: 2019-09-02
  • H2O – Water, oxidane source: wikipedia, accessed: 2019-09-27
    • Other names: Water (H2O) source: wikipedia, accessed: 2019-09-27, Hydrogen hydroxide (HH or HOH) source: wikipedia, accessed: 2019-09-27, Hydrogen oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas source: wikipedia, accessed: 2019-09-27

Products:

  • Mn(NO3)2 – Manganese(II) nitrate source: wikipedia, accessed: 2019-09-27
    • Other names: Manganese dinitrate source: wikipedia, accessed: 2019-09-27, Manganese nitrate source: wikidata, accessed: 2019-09-02
    • Appearance: White powder source: wikipedia, accessed: 2019-09-27
  • HNO3 – Nitric acid source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02
    • Other names: Aqua fortis source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: NIOSH NPG, accessed: 2019-09-02, Spirit of niter source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Eau forte source: wikipedia, accessed: 2019-09-27
    • Appearance: Colorless, yellow or red fuming liquid source: wikipedia, accessed: 2019-09-27; Colourless-to-yellow liquid with pungent odour source: ICSC, accessed: 2019-09-04; Colorless, yellow, or red, fuming liquid with an acrid, suffocating odor. [Note: Often used in an aqueous solution. Fuming nitric acid is concentrated nitric acid that contains dissolved nitrogen dioxide.] source: NIOSH NPG, accessed: 2019-09-02