Mole ratio — Science definition
A ratio between the amounts of any two substances in a reaction, taken directly from the coefficients of the balanced equation.
Where it is taught
- Stoichiometry — Stoichiometry & Yield, Physical Science: Chemistry, Grade 11
In use
The heart of stoichiometry is the mole ratio — a ratio between two substances read straight off the balanced coefficients.
Stoichiometry
Questions using mole ratio
Problem 1
In the balanced equation N₂ + 3H₂ → 2NH₃, what is the mole ratio of H₂ to NH₃?
- 3 : 1
- 3 : 2
- 1 : 1
- 2 : 3
Answer and explanation
3 : 2
The coefficients give H₂ : NH₃ = 3 : 2, read straight from the balanced equation.