Stoichiometry Calculator

Convert moles or grams between reactants and products using balanced equation stoichiometry.

⚛️ Stoichiometry Converter

For reaction: aA → bB. Enter known substance, get unknown substance amount.

GIVEN SUBSTANCE A
DESIRED SUBSTANCE B
⚠ Enter valid positive values.
Stoichiometry Map
mol_B = mol_A × (b/a)
Moles of B
mol

⚛️ Stoichiometry Road Map

Mass A → Moles A → Moles B → Mass B
  1. Convert mass to moles: n = m / M
  2. Mole ratio: mol_B = mol_A × (coeff_B / coeff_A)
  3. Convert moles to mass: m = n × M

📖 Example

✅ 2H₂ + O₂ → 2H₂O

How many grams of H₂O from 4g of H₂?

mol H₂ = 4/2.016 = 1.984 mol

mol H₂O = 1.984 × (2/2) = 1.984 mol

mass H₂O = 1.984 × 18.015 = 35.7 g

❓ FAQ

What are mole ratios?
Mole ratios come from the balanced equation coefficients. In N₂ + 3H₂ → 2NH₃, the ratio of N₂:H₂:NH₃ = 1:3:2. For every 1 mole N₂, you get 2 moles NH₃.
Why must the equation be balanced?
Stoichiometry is based on conservation of mass. The balanced equation ensures atom counts are equal on both sides, giving valid mole ratios for calculations.
Comprehensive Guide

The Science Behind Stoichiometry

Leverage this Stoichiometry Calculator to instantly determine exact values without the hassle of manual formula manipulation. A solid grasp of Stoichiometry is critical for safely and effectively handling chemical compounds in practical scenarios. Mastering the concepts behind Stoichiometry is crucial for understanding advanced chemical reactions and laboratory procedures.

Why is Stoichiometry Important?

In analytical chemistry, precision is everything. Having a reliable way to compute Stoichiometry saves time, prevents wasted materials, and ensures scientific accuracy.

Speed
Instant
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Accuracy
100%
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Level
All Levels

Always verify your input units before calculating. Mismatched units (e.g., using mL instead of L) are the most common source of error when determining Stoichiometry!

Common Applications

  • Academic Study: Checking literature values against experimental yields.
  • Laboratory Practice: Calculating theoretical thresholds for experiments.
  • Data Validation: Improving general chemistry proficiency.

Relying solely on the calculator without understanding the underlying formula. Always review the step-by-step breakdown to internalize the mechanics.