2 Cl2O7 + 4 K + O2 → 4 KClO4

This is an oxidation-reduction (redox) reaction:

4 K0 - 4 e- → 4 KI (oxidation)

2 O0 + 4 e- → 2 O-II (reduction)

K is a reducing agent, O2 is an oxidizing agent.

Reactants:

  • Cl2O7 – Dichlorine heptoxide source: wikipedia, accessed: 2019-09-27
    • Other names: Chlorine(VII) oxide; Perchloric anhydride; (Perchloryloxy)chlorane trioxide source: wikipedia, accessed: 2019-09-27
    • Appearance: Colorless liquid source: wikipedia, accessed: 2019-09-27
  • K
    • Names: Potassium source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04, K source: wikidata, accessed: 2019-09-07, Element 19 source: wikidata, accessed: 2019-09-07, Kalium source: wikidata, accessed: 2019-09-07source: ICSC, accessed: 2019-09-04
    • Appearance: White-to-grey lumps source: ICSC, accessed: 2019-09-04
  • 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

Products:

  • KClO4
    • Names: Potassium perchlorate source: wikipedia, accessed: 2019-09-27source: wikidata, accessed: 2019-09-02source: ICSC, accessed: 2019-09-04, Potassium chlorate(VII); Perchloric acid source: wikipedia, accessed: 2019-09-27, Potassium salt; peroidin source: wikipedia, accessed: 2019-09-27
    • Appearance: Colourless/ white crystalline powder source: wikipedia, accessed: 2019-09-27; Colourless crystals or white crystalline powder source: ICSC, accessed: 2019-09-04