Chemical Reactions Calculator

Understanding Chemical Reaction Stoichiometry

Stoichiometry is a fundamental concept in chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction. It is based on the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction. The coefficients in a balanced chemical equation represent the molar ratios of the substances involved.

This calculator helps you determine the theoretical yield of a product (in moles) given the amount of a reactant (in moles) and their respective stoichiometric coefficients from a balanced chemical equation.

The Math Behind the Calculation

The core principle is using the mole ratio derived from the balanced chemical equation. If a balanced chemical equation is represented as:

a A + b B → c C + d D

Where:

• A and B are reactants.
• C and D are products.
• a, b, c, and d are their respective stoichiometric coefficients.

The mole ratio between Reactant A and Product B is a : c. This means for every a moles of Reactant A consumed, c moles of Product B are produced.

To calculate the moles of Product B produced from a given amount of Reactant A, we use the following formula:

Moles of Product B = (Moles of Reactant A) * (Coefficient of Product B / Coefficient of Reactant A)

In our calculator, this translates to:

Moles of [Product B Name] = (Moles of [Reactant A Name]) * ([Product B Coefficient] / [Reactant A Coefficient])

How to Use This Calculator

1. Identify Reactant A: Enter the chemical formula or name of the reactant you are starting with (e.g., H2, O2, CH4).
2. Enter Moles of Reactant A: Input the known quantity of Reactant A in moles.
3. Enter Reactant A Coefficient: Find the stoichiometric coefficient for Reactant A in your balanced chemical equation and enter it here.
4. Identify Product B: Enter the chemical formula or name of the product you want to calculate the yield for (e.g., H2O, CO2).
5. Enter Product B Coefficient: Find the stoichiometric coefficient for Product B in your balanced chemical equation and enter it here.
6. Click "Calculate Product B Yield": The calculator will output the theoretical yield of Product B in moles.

Example Calculation

Consider the synthesis of water from hydrogen and oxygen:

2 H₂ + O₂ → 2 H₂O

Let's say we start with 5.0 moles of Hydrogen gas (H₂). We want to find out how many moles of water (H₂O) can be produced.

• Reactant A Name: H2
• Moles of Reactant A: 5.0
• Reactant A Coefficient: 2
• Product B Name: H2O
• Product B Coefficient: 2

Using the formula:

Moles of H₂O = (5.0 moles H₂) * (2 moles H₂O / 2 moles H₂) = 5.0 moles H₂O

If we started with 3.0 moles of Oxygen gas (O₂) in the same reaction:

• Reactant A Name: O2
• Moles of Reactant A: 3.0
• Reactant A Coefficient: 1
• Product B Name: H2O
• Product B Coefficient: 2

Using the formula:

Moles of H₂O = (3.0 moles O₂) * (2 moles H₂O / 1 mole O₂) = 6.0 moles H₂O

This calculator simplifies these stoichiometric calculations, providing quick and accurate results for various chemical reactions.

' + productBName + '

' + molesProductB.toFixed(4) + ' moles