Balancing Equations

Conservation of mass: The number of atoms of each element must be equal on both sides.
Coefficients only: Change coefficients (numbers in front), never subscripts.
Lowest whole numbers: Use the smallest set of whole-number coefficients.

Strategy

Balance elements that appear in only one reactant and one product first.
Balance O and H last (they often appear in multiple compounds).
If fractions appear, multiply all coefficients to clear them.

Balancing Chemical Equations

Enter the coefficients to balance each equation. Leave blank or enter 1 for a coefficient of 1.

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