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Mole Ratio Definition

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The mole ratio is a fraction or ratio of atoms in compounds in a chemical reaction.

The mole ratio is a fraction or ratio of atoms in compounds in a chemical reaction

Ben Mills, Public Domain

Definition: A mole ratio is ratio between the amounts in moles of any two compounds involved in a chemical reaction. Mole ratios are used as conversion factors between products and reactants in many chemistry problems.

Examples: For the reaction:

2 H2(g) + O2(g) → 2 H2O(g)

The mole ratio between O2 and H2O is 1:2. For every 1 mole of O2 used, 2 moles of H2O are formed.

The mole ratio between H2 and H2O is 1:1. For every two moles of H2 used, 2 moles of H2O is formed.

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