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Molar Mass

Calculate the molar mass of any chemical compound from its molecular formula. Includes percent composition, mass-mole conversions, and element breakdown analysis.

Run the CalculationExplore molecular and chemical calculations
⚗️Molar Mass CalculatorM = Σ(n × A) | n = m/M

Compact Examples

💧 Water (H₂O)
The universal solvent - essential for all known life forms
🍬 Glucose (C₆H₁₂O₆)
Simple sugar - primary energy source for cells
🧂 Sodium Chloride (NaCl)
Common table salt - essential electrolyte
⚗️ Sulfuric Acid (H₂SO₄)
Industrial workhorse - most produced chemical
☕ Caffeine (C₈H₁₀N₄O₂)
Central nervous system stimulant found in coffee
💊 Aspirin (C₉H₈O₄)
Common pain reliever and anti-inflammatory

Inputs

Enter formula using element symbols and subscript numbers
For mass calculations

For educational and informational purposes only. Verify with a qualified professional.

📋 Key Takeaways

  • • M = Σ(n × A) | Sum atomic masses × atom counts
  • • n = m/M | Moles from mass; m = n × M
  • • % = (element mass / M) × 100 | Percent composition
  • • 1 mol = 6.022×10²³ | Avogadro's number

Did You Know?

💧

H₂O = 18.015 g/mol; NaCl = 58.44 g/mol.

Source: IUPAC

🍬

Glucose C₆H₁₂O₆ = 180.16 g/mol.

Source: Biochemistry

⚛️

Molar mass = molecular weight in g/mol.

Source: Stoichiometry

📐

Use subscripts: H2O, C6H12O6 (no special chars).

Source: Parser

🧪

Essential for stoichiometry and solution prep.

Source: Lab

📊

Percent composition sums to 100%.

Source: Analytical

How the Molar Mass Calculator Works

Enter formula (e.g. H2O, NaCl) or select elements. Parser sums n × atomic mass for each element.

Formula

M = Σ(n × A)

Moles

n = m/M; m = n × M

Expert Tips

Subscripts

H2O not H₂O; C6H12O6.

Parentheses

Ca(OH)2, (NH4)2SO4.

Hydrates

CuSO4·5H2O.

IUPAC

Uses standard atomic weights.

Common Compounds (g/mol)

CompoundM (g/mol)
H₂O18.015
NaCl58.44
C₆H₁₂O₆180.16
CO₂44.01

FAQ

What is molar mass?

Mass of 1 mole in g/mol. M = Σ(n × atomic mass).

Molar mass vs molecular weight?

Same value; g/mol vs amu.

How to enter hydrates?

CuSO4·5H2O or CuSO4.5H2O.

Percent composition?

% = (element mass in 1 mol / M) × 100.

Moles from mass?

n = m / M.

Avogadro number?

6.022×10²³ particles per mole.

Key Numbers

6.022×10²³
Avogadro
18.015
H₂O (g/mol)
58.44
NaCl (g/mol)
180.16
Glucose (g/mol)

📚 Official Sources

IUPAC Atomic Weights ↗
IUPAC standard atomic weights
NIST Chemistry WebBook ↗
Molar mass and thermodynamic data
CIAAW Tables ↗
Commission on Isotopic Abundances and Atomic Weights

⚠️ Disclaimer: Uses IUPAC atomic weights. Consult CIAAW and NIST for precise data.

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