Stoichiometry Calculator for Chemical Reactions
📚 Reference Information
⚛️ Molar Masses
H: 1 g/mol
C: 12 g/mol
N: 14 g/mol
O: 16 g/mol
Na: 23 g/mol
Cl: 35.5 g/mol
C: 12 g/mol
N: 14 g/mol
O: 16 g/mol
Na: 23 g/mol
Cl: 35.5 g/mol
📐 Formulas
n = m / M
V = n × 22.4 L/mol
Yield = (actual/theoretical) × 100%
Coefficients = ratios
V = n × 22.4 L/mol
Yield = (actual/theoretical) × 100%
Coefficients = ratios
💡 Tips
Always balance equations
Check units of measurement
Round to significant figures
Consider reaction conditions
Check units of measurement
Round to significant figures
Consider reaction conditions
📖 Calculation Examples
Example 1:
2H₂ + O₂ → 2H₂O
If 4 mol H₂ available:
Need 2 mol O₂
Will form 4 mol H₂O
2H₂ + O₂ → 2H₂O
If 4 mol H₂ available:
Need 2 mol O₂
Will form 4 mol H₂O
Example 2:
CH₄ + 2O₂ → CO₂ + 2H₂O
16 g CH₄ (1 mol):
Need 64 g O₂ (2 mol)
Will form 44 g CO₂
CH₄ + 2O₂ → CO₂ + 2H₂O
16 g CH₄ (1 mol):
Need 64 g O₂ (2 mol)
Will form 44 g CO₂
⚗️ Stoichiometry Calculator
Powerful tool for calculating quantities of substances in chemical reactions. Calculate moles, masses, and volumes based on stoichiometric coefficients.
🎯 Calculator Features:
- ✅ Calculate based on moles
- ✅ Convert between mass and moles
- ✅ Calculate gas volumes at STP
- ✅ Determine limiting reagent
- ✅ Theoretical and practical yield
Frequently Asked Questions
What is stoichiometry?
Stoichiometry is the branch of chemistry that studies quantitative relationships between substances in chemical reactions based on the law of conservation of mass.
How to find molar mass?
Molar mass equals the sum of atomic masses of all atoms in a molecule. For example, for H₂O: M = 2×1 + 16 = 18 g/mol.
What is a limiting reagent?
The limiting reagent is the substance that is completely consumed first in a reaction and determines the maximum amount of product.
How to calculate gas volume at STP?
At standard conditions (0°C, 1 atm), 1 mole of any gas occupies 22.4 L. V = n × 22.4 L/mol.
What is reaction yield?
Reaction yield is the ratio of actually obtained product quantity to theoretically possible amount, expressed as a percentage.