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Iron oxidises in moist air

4 Fe + 3 O2 -> 2 Fe2O3. The metallic surface develops a rough red-brown coating over time.

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Scale this equation

Enter any molar amount; the balanced ratio calculates the theoretical product.

Fe2O30.5 mol
Output
Product and observation diagram for Iron oxidises in moist air
The metallic surface develops a rough red-brown coating over time.
Fe2O30.5 mol

Theoretical amount for 1 mol of Fe

Rust brown #A8431E
Input
Reactant diagram for Iron oxidises in moist air
Fe enters under oxygen, moisture and time
Fe1 mol

oxygen, moisture and time

Relationship

What connects the input and output?

Water and dissolved oxygen support electrochemical oxidation; hydrated iron oxides form in real rust. Use the calculator to scale the balanced molar relationship to any amount of Fe.

Sources

3
  1. OpenStax Chemistry 2e: Writing and Balancing Chemical EquationsOpenStaxCC BY 4.0
  2. OpenStax Chemistry 2e: Classifying Chemical ReactionsOpenStaxCC BY 4.0
  3. NIST Chemistry WebBook, SRD 69National Institute of Standards and Technology

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