⚠️
Unbalanced
Reactants
0 atoms
⚖️ Mass Balance
0°
Left
Atom Count
Right
Products
0 atoms
Change Coefficients, Never Subscripts
Coefficients change the molecule count. Subscripts change the substance itself.
✅ Allowed: Coefficient
2
2 H2O
Water molecules
❌ Forbidden: Subscript
H2O2
Hydrogen Peroxide!
1. Count Atoms
Multiply coefficient × subscript.
2. Metals & C First
Balance single-species elements.
3. H & O Last
Balance H₂ and O₂ gases last.
4. Simplest Ratio
Divide out common factors.
#1
Water Synthesis
Beginner
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Reactants
Atom Counter
Products
⚗️ Custom Reaction Builder
Enter any unbalanced equation (e.g., Al + O2 -> Al2O3) to open in the Visual Lab.