Molar Ratio Calculator
Calculate molar ratios from balanced chemical equations and determine stoichiometric relationships
Calculate Molar Ratio
Reactants
Products
Select Components for Ratio
Molar Ratio Results
Formula: Molar ratio = Coefficient₁ : Coefficient₂
Note: Molar ratios are derived from the balanced chemical equation coefficients
Quick Examples
Water Formation
2H₂ + O₂ → 2H₂O
H₂:O₂ = 2:1
H₂:H₂O = 2:2 = 1:1
Ammonia Synthesis
N₂ + 3H₂ → 2NH₃
N₂:H₂ = 1:3
H₂:NH₃ = 3:2
Combustion of Methane
CH₄ + 2O₂ → CO₂ + 2H₂O
CH₄:O₂ = 1:2
O₂:H₂O = 2:2 = 1:1
Understanding Molar Ratios in Chemical Reactions
What are Molar Ratios?
Molar ratios represent the proportional relationship between reactants and products in a balanced chemical equation. They are derived from the stoichiometric coefficients and tell us exactly how many moles of one substance react with or produce another.
Basic Formula
A : B = CoefficientA : CoefficientB
From balanced equation: aA + bB → cC + dD
Applications
Stoichiometric Calculations
Determine exact amounts needed for complete reaction
Limiting Reagent Analysis
Identify which reactant will be consumed first
Yield Predictions
Calculate theoretical and percent yields
Step-by-Step Process
1. Balance Equation
Ensure the chemical equation is properly balanced with correct coefficients
2. Identify Coefficients
Extract the numerical coefficients for the substances of interest
3. Calculate Ratio
Form the ratio using the coefficients and simplify if possible
4. Apply to Problem
Use the ratio to solve for unknown quantities in the reaction