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Stoichiometry Calculator

Input the chemical equation, and the calculator will instantly determine the number of reactants and products involved

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This stoichiometry calculator lets you calculate the relative amounts of reactants and products involved in a chemical reaction.

Our tool helps you determine the exact number of moles or grams of the entities involved in a chemical equation.

What Is Stoichiometry?

In chemistry, understanding the quantities of substances involved in reactions is crucial for predicting outcomes and optimizing processes.

“Stoichiometry is the branch of chemistry that deals with calculating the amounts of reactants and products in chemical reactions based on the balanced chemical equation.”

By using stoichiometry, chemists can determine how much of each substance is required or produced, which is essential for laboratory experiments, industrial processes, and environmental calculations.

Stoichiometric Coefficients:

“Stoichiometric coefficients are the numbers placed before chemical formulas in a balanced equation to indicate the relative amounts of molecules or moles involved in the reaction.”

Types of Stoichiometry:

Stoichiometric calculations can vary depending on which quantities are known or needed. Common types include:

Moles to Moles Stoichiometry – calculating the amount of one substance from another in moles.
Mass to Moles or Mass to Mass Stoichiometry – converting between mass and moles to find the required or produced mass of a substance.

Example Stoichiometry Problem:

Consider the reaction:

2 H₂ + O₂ → 2 H₂O

If you start with 4 moles of H₂, how many moles of water will be produced?

Using the stoichiometric coefficients from the balanced equation, the ratio of H₂ to H₂O is 2:2. Therefore, 4 moles of H₂ will produce 4 moles of H₂O.

Example # 02:

Imagine you are analyzing the reaction of aluminum with hydrochloric acid to produce aluminum chloride and hydrogen gas. Determine the mass of hydrogen gas produced when 27 grams of aluminum reacts completely.

Solution:

Step # 01:

The balanced chemical equation is:

2 Al + 6 HCl → 2 AlCl₃ + 3 H₂

Step # 02:

Atomic masses:

Al = 27

H = 1

Cl = 35.5

Molecular masses:

AlCl₃ = 27 + (3 × 35.5) = 133.5

H₂ = 2 × 1 = 2

Step # 03:

Convert mass of aluminum to moles:

Moles of Al = 27 g ÷ 27 g/mol = 1 mol

Step # 04:

Use stoichiometric ratio to find moles of H₂ produced:

2 Al : 3 H₂ → 1 mol Al produces (3/2) × 1 = 1.5 mol H₂

Convert moles of H₂ to grams: 1.5 × 2 = 3 g of hydrogen gas

Total mass of products (AlCl₃ + H₂) = 1 mol AlCl₃ × 133.5 + 3 g H₂ = 136.5 g

How Solution Stoichiometry Calculator Works?

This free tool simplifies stoichiometric calculations for any chemical reaction. Here is how it works:

Input:

Enter your chemical reaction in the input field or select a pre-saved example.
Click the calculate button to process the reaction.

Output:

Shows the amount of reactants and products in both moles and grams.

References:

From Wikipedia: Stoichiometry, Etymology, Converting grams to moles, Molar proportion, Determining amount of product, Stoichiometric ratio, Limiting reagent and percent yield, Stoichiometry matrix

From Khan Academy: Balancing chemical equations, Calculating amounts of reactants and products, Ideal stoichiometry

From Lumen Learning: Reaction Stoichiometry, Moles to Moles, Grams to Moles

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