Advanced Stoichiometry Ratio Calculator

Calculate stoichiometry ratios including mole and mass ratios in chemical reactions using balanced equations. Supports multiple components, molar masses for mass calculations, and optional given amounts for limiting reactant analysis.

Enter Reaction Components ▼

🔍 Enter mass (g) of the given component to calculate amounts for others.

Add Comparison Reaction (Optional) ▼

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Stoichiometry Ratio Comparison

Formulas

Stoichiometry Ratio Calculation

Stoichiometry ratios are derived from balanced chemical equations. Mole ratios are direct from coefficients, while mass ratios incorporate molar masses.

Mole Ratio (A : B) = coefficient_A : coefficient_B

For mass ratios:

Mass Ratio (A : B) = (coefficient_A × MM_A) : (coefficient_B × MM_B)

If given amount for component X (mass m_X):

Moles_X = m_X / MM_X; Moles_Y = Moles_X × (coeff_Y / coeff_X); Mass_Y = Moles_Y × MM_Y

Where:

  • coefficientₙ: Stoichiometric coefficient for the nth component.
  • MMₙ: Molar mass of the nth component in g/mol.

Usage Notes:

  • Coefficients should reflect a balanced equation.
  • Molar masses are optional for mole ratios but required for mass calculations.
  • Given amount enables calculation of product masses or limiting reactant identification.

How to Use the Stoichiometry Ratio Calculator

  1. Enter Reaction Components: Provide chemical formulas, stoichiometric coefficients, and optional molar masses for the balanced equation.
  2. Specify Given Amount (Optional): Input mass of a specific component to calculate corresponding amounts for others.
  3. Add Comparison Reaction (Optional): Include another reaction for comparative stoichiometric analysis.
  4. Choose Display Mode: Select standard, step-by-step, or chart view for results.
  5. Calculate: Click “Calculate” to compute mole/mass ratios and amounts.
  6. Export Results (Optional): Download results as JSON for further use.
  7. Reset Data: Click “Reset” to clear all fields and start over.

FAQs (Frequently Asked Questions)

What is stoichiometry ratio in chemistry?

Stoichiometry ratio refers to the proportional relationship between reactants and products in a chemical reaction, based on the balanced equation. It allows calculation of amounts of substances involved, such as moles, masses, or volumes.

How do you calculate mole ratios in stoichiometry?

Mole ratios are obtained directly from the coefficients in the balanced chemical equation. For example, in 2H2 + O2 → 2H2O, the mole ratio of H2 to O2 is 2:1.

What is the difference between mole ratio and mass ratio?

Mole ratio is based solely on stoichiometric coefficients, representing particle numbers. Mass ratio incorporates molar masses: Mass ratio = (coefficient × molar mass) for each substance, useful for lab calculations.

How to find the limiting reactant using stoichiometry?

Calculate moles of each reactant, then divide by their coefficients. The reactant with the smallest value is limiting, determining the maximum product yield.

Where can I find molar masses for compounds?

Molar masses are calculated from atomic masses in the periodic table. Resources like NIST Chemistry WebBook or textbooks provide values for common compounds.