Mole Ratio Calculator

Mole Ratio Calculator

The calculator helps students, chemists, and researchers to calculate the molar ratios for the known stoichiometric values of a balanced chemical reaction.

I want to calculate:

First Reactant

Coefficient in balanced reaction:

Number of moles or molecules:

Number of atoms in one molecule:

Molecular Weight:

Mass of First Reactant:

Second Reactant

Coefficient in balanced reaction:

Number of moles or molecules:

Number of atoms in one molecule:

Molecular Weight:

Mass of Second Reactant:

First Product

Coefficient in balanced reaction:

Number of moles or molecules:

Number of atoms in one molecule:

Molecular Weight:

Mass of First Product:

Second Product

Coefficient in balanced reaction:

Number of moles or molecules:

Number of atoms in one molecule:

Molecular Weight:

Mass of First Product:

Mole Ratio Calculator

The mole ratio calculator calculates the ratio of moles between reactants and products based on the balanced chemical equation.

What Is Mole to Mole Ratio?

Mole ratio is a conversion factor that proportionally relates the amounts of chemical substances involved in a reaction. SI Unit: Mole

Mole Ratio Formula

Mole Ratio = Moles of Reactants / Moles of Products

The values come from the coefficients of the balanced chemical equation.

Example:

Consider the balanced reaction:

\(N_2 (g) + 3 H_2 (g) \rightarrow 2 NH_3 (g)\)

This reaction has six mole ratios:

\(3 \, \text{mol } H_2 / 1 \, \text{mol } N_2\) or \(1 \, \text{mol } N_2 / 3 \, \text{mol } H_2\)
\(1 \, \text{mol } N_2 / 2 \, \text{mol } NH_3\) or \(2 \, \text{mol } NH_3 / 1 \, \text{mol } N_2\)
\(3 \, \text{mol } H_2 / 2 \, \text{mol } NH_3\) or \(2 \, \text{mol } NH_3 / 3 \, \text{mol } H_2\)

Related: If your reaction is unbalanced, use the Balancing Chemical Equations Calculator.

How To Find Mole Ratio

Mole ratios are useful for estimating the theoretical yield:

Balance the chemical equation.
Identify the coefficients of reactants and products.
Determine the ratio of coefficients to get the mole ratio.

Solved Example (Mole Ratio)

Reaction: \(N_2 (g) + 3 H_2 (g) \rightarrow 2 NH_3 (g)\)

If 5.83 moles of hydrogen reacts with excess nitrogen, how many moles of ammonia are produced?

Solution:

Step 1: Given Values

Moles of \(H_2\) = 5.83

Step 2: Unknown Quantity

Moles of \(NH_3\) = ?

Step 3: Identify the Problem

Convert moles of \(H_2\) to moles of \(NH_3\) using the mole ratio from the balanced equation.

Step 4: Solve

\[ 5.83 \, \text{mol } H_2 \times \frac{2 \, \text{mol } NH_3}{3 \, \text{mol } H_2} = 3.88 \, \text{mol } NH_3 \]

Answer: 3.88 moles of ammonia will be produced.

Mole Ratio Calculator Tool

Use the Mole Ratio / Stoichiometry Calculator to find stoichiometric relationships:

Step 1: Enter stoichiometric coefficients of reactants and products.
Step 2: Click Calculate.
Step 3: View the mole ratio for each substance.

Mole Ratio in Water

Reaction: \(2 H_2 + O_2 \rightarrow 2 H_2O\)

Mole Ratio = 2 : 1 : 2 (H₂ : O₂ : H₂O)

mole ratio in water

Mole Ratio from Molecular Weight

Calculate moles of each substance using mass and molecular weight.
Use formula: Mole Ratio = Moles of Reactant / Moles of Product.
Compare ratios to determine limiting reagents, product yield, or other stoichiometric calculations.