2 CrO3 + 2 NH3 → N2 + Cr2O3 + 3 H2O – Balanced equation

Or you want a quick look:

This is an oxidation-reduction (redox) reaction:

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2 N-III - 6 e- 2 N (oxidation)

2 CrVI + 6 e- 2 CrIII (reduction)

NH3 is a reducing agent, CrO3 is an oxidizing agent.

This is a precipitation reaction: Cr2O3 is the formed precipitate.

This is a gas evolution reaction, N2 is the formed gas.

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  • CrO3Chromium trioxide
    • Other names: Chromic anhydride , Chromium(VI) oxide , Chromic acid (misnomer)
    • Appearance: Dark red granular solid, deliquescent ; Odourless dark red deliquescent crystals, flakes or granular powder
  • NH3
    • Names: Ammonia , Azane (only intended for use in naming derivatives of ammonia) , Hydrogen nitride
    • Appearance: Colourless gas ; Colourless gas or compressed liquefied gas with pungent odour ; Colorless gas with a pungent, suffocating odor. [Note: Shipped as a liquefied compressed gas. Easily liquefied under pressure.]


  • N2
    • Names: Dinitrogen , Nitrogen (compressed gas) , Nitrogen (liquified)
    • Appearance: Odourless colourless compressed gas ; Odourless colourless extremely cold liquid
  • Cr2O3
    • Names: Chromium(III) oxide , Chromium sesquioxide , Chromia
    • Appearance: Light to dark green, fine crystals ; Light-to-dark-green powder
  • H2OWater, oxidane
    • Other names: Water (H2O) , Hydrogen hydroxide (HH or HOH) , Hydrogen oxide
    • Appearance: White crystalline solid, almost colorless liquid with a hint of blue, colorless gas
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