Mass-to-Mass Stoichiometry Calculator Formula

Understand the math behind the mass-to-mass stoichiometry calculator. Each variable explained with a worked example.

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Formulas Used

Mass of Product

mass_product = (mass_reactant / mw_reactant) * (coeff_product / coeff_reactant) * mw_product

Moles of Reactant

moles_reactant = mass_reactant / mw_reactant

Variables

VariableDescriptionDefault
mass_reactantMass of Reactant(g)10
mw_reactantMolar Mass of Reactant(g/mol)40.08
coeff_reactantCoefficient of Reactant1
coeff_productCoefficient of Product1
mw_productMolar Mass of Product(g/mol)44.01

How It Works

Mass-to-Mass Stoichiometry

Formula

mass_product = (mass_reactant / Mw_reactant) × (coeff_product / coeff_reactant) × Mw_product

Steps: grams to moles, apply mole ratio, moles to grams.

Worked Example

10 g of Ca (40.08 g/mol) reacting 1:1 to form CO2 (44.01 g/mol).

mass_reactant = 10mw_reactant = 40.08coeff_reactant = 1coeff_product = 1mw_product = 44.01
  1. 01Moles reactant = 10 / 40.08 = 0.2495 mol
  2. 02Moles product = 0.2495 × (1/1) = 0.2495 mol
  3. 03Mass product = 0.2495 × 44.01 = 10.98 g

Frequently Asked Questions

What is stoichiometry?

The calculation of quantities of reactants and products in chemical reactions based on balanced equations.

Why must the equation be balanced?

Balancing ensures conservation of mass and gives correct mole ratios between substances.

What if I have multiple products?

Calculate each product separately using its own coefficient and molar mass.

Learn More

Guide

Stoichiometry Basics Guide

Learn the fundamentals of stoichiometry: mole ratios, mass-to-mass conversions, limiting reagents, theoretical yield, and percent yield with clear examples.

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