Stoichiometry Calculator – Balance Chemical Reactions Instantly

Stoichiometry calculates the quantities of reactants and products in chemical reactions. You use balanced chemical equations to determine mole ratios between substances. These ratios let you convert between amounts of different reactants and products.

Stoichiometry Steps

1. Write and balance the chemical equation
2. Convert given quantities to moles
3. Use mole ratios from coefficients to find moles of unknown
4. Convert moles of unknown to desired units

Example: Combustion of Methane

From this equation:

• 1 mole CH₄ reacts with 2 moles O₂
• 1 mole CH₄ produces 1 mole CO₂ and 2 moles H₂O
• Mole ratio CH₄:O₂:CO₂:H₂O = 1:2:1:2

Stoichiometry Example Problem

How many grams of CO₂ form from 16 g of CH₄?

1. Convert 16 g CH₄ to moles: 16 g / 16.04 g/mol = 1.0 mol CH₄
2. Use mole ratio: 1 mol CH₄ produces 1 mol CO₂
3. Convert to grams: 1.0 mol × 44.01 g/mol = 44.01 g CO₂