10 Fe3O4 + 92 HNO3 → 30 Fe(NO3)3 + N2 + 46 H2O

This is an acid-base reaction (neutralization): Fe3O4 is a base, HNO3 is an acid.

This is an oxidation-reduction (redox) reaction:

2 NV + 10 e- → 2 N0 (reduction)

30 Fe8/3 - 10 e- → 30 FeIII (oxidation)

HNO3 is an oxidizing agent, Fe3O4 is a reducing agent.

Reactants:

  • Fe3O4 – Iron(II) iron(III) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02
    • Other names: Iron(II,III) oxide source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Ferrous ferric oxide source: wikipedia, accessed: 2019-09-27, Ferroso ferric oxide source: wikipedia, accessed: 2019-09-27
    • Appearance: Solid black 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

Products:

  • Fe(NO3)3 – Iron(III) nitrate source: wikipedia, accessed: 2019-09-27
    • Other names: Ferric nitrate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02, Nitric acid source: wikipedia, accessed: 2019-09-27, Iron(3+) salt source: wikipedia, accessed: 2019-09-27, Iron (III) nitrate source: wikidata, accessed: 2019-09-02
    • Appearance: Pale violet crystals | hygroscopic source: wikipedia, accessed: 2019-09-27
  • N2
    • Names: Dinitrogen source: wikidata, accessed: 2019-09-07, Nitrogen (compressed gas) source: ICSC, accessed: 2019-09-04, Nitrogen (liquified) source: ICSC, accessed: 2019-09-04
    • Appearance: Odourless colourless compressed gas source: ICSC, accessed: 2019-09-04; Odourless colourless extremely cold liquid source: ICSC, accessed: 2019-09-04
  • 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