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Stoichiometry Calculator

Science & Engineering

Auto-balance · mass/moles/gas volume from coefficients

Quick Answer

Stoichiometry Calculator: Auto-balance · mass/moles/gas volume from coefficients. Stoichiometry Calculator uses standard science & engineering formulas to compute accurate results instantly.

Balanced equation
CaCO₃ → CaO + CO₂
Known amount (mol)0.9991 mol
Coefficient ratio1 : 1 : 1
Total reactants100 g
Total products100 g
SubstanceCoeffM (g/mol)n (mol)m (g)Gas vol (STP)
CaCO₃(known)1100.10.9991100—
CaO156.080.999156.03—
CO₂144.010.999143.9722.38 L

Calculation steps

  1. 1Balanced equation: CaCO₃ → CaO + CO₂ (coefficients 1 : 1 : 1)
  2. 2M(CaCO₃) = 100.1 g/mol
  3. 3M(CaO) = 56.08 g/mol
  4. 4M(CO₂) = 44.01 g/mol
  5. 5Known: n(CaCO₃) = 100 g ÷ 100.1 g/mol = 0.9991 mol
  6. 6Mole ratio: n(x) = 0.9991 × (coeff(x) ÷ 1)
  7. 7n(CaO) = 0.9991 mol → m = 56.03 g
  8. 8n(CO₂) = 0.9991 mol → m = 43.97 g
  9. 9Conservation check: reactants 100 g ≈ products 100 g ✓

The mole bridge — quick reference

ConversionFormulaNoteExample
Mass → molesn = m ÷ MM = molar mass (g/mol)36 g water = 2 mol
Moles → gas volume (STP)V = n × 22.4 LGases only, 0°C 101 kPa1 mol H₂ = 22.4 L
Moles → particlesN = n × 6.02×10²³Avogadro's number1 mol ≈ 6.02×10²³
Mass ratio from equationratio of (coeff × M)Read from balanced coefficients2H₂ + O₂ → 4 : 32
Solution concentrationc = n ÷ VUnit mol/L0.5 mol ÷ 2 L = 0.25 mol/L
Percent yieldactual ÷ theoretical × 100%Theoretical = this table44 g theory, 40 g actual → 90.9%
Unbalanced equations are balanced automatically (coefficients shown in the hero card). Gas volumes are at STP (0°C, 101 kPa, 22.4 L/mol) and shown for gaseous substances only. Theoretical yield from this table is the basis of percent yield (actual ÷ theoretical × 100%). Atomic weights cover the 50 common elements.

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How to Use

  1. Enter known quantities: fill values and confirm units in the Stoichiometry Calculator.
  2. Instant solution: unknowns solve live with the formula shown transparently.
  3. Use constant/material tables: standard physical constants and material data are listed on this page.
  4. Compare conditions: change inputs to compare scenarios.

Key Points

  • Stoichiometry Calculator is a free online science & engineering tool — open and use, no sign-up.
  • All calculations run locally in your browser; your data never leaves the device.
  • Key capability: Auto-balance · mass/moles/gas volume from coefficients.
  • Results come with formulas and reference tables so you can verify every number.

Formula & How It Works

Stoichiometry Calculator formula

Stoichiometry Calculator uses standard science & engineering formulas to compute accurate results instantly.

FAQ

How do I use the Stoichiometry Calculator?
Open the page and fill in the input fields — results update automatically. Auto-balance · mass/moles/gas volume from coefficients.
Are the results accurate?
Yes. Standard formulas and conversion factors are used and verified.
Is it free? Do I need to sign up?
Completely free. No registration, login or download required.
Does it work on mobile?
Yes. The responsive design works on phones, tablets and desktops.
Is my data saved?
No. Everything runs locally in your browser.

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Source & Updates

Based on CODATA recommended constants and standard physics formulas. Last updated: 2025-07

Last updated:

Formulas and content on this page are reviewed by the YiJianSuan team. For reference only — official sources prevail.

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Results provided by this tool are for reference only and do not constitute professional advice.