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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.

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โš—๏ธMolar Mass CalculatorM = ฮฃ(n ร— A) | n = m/M

Compact Examples

๐Ÿ’ง Water (Hโ‚‚O)
The universal solvent - essential for all known life forms
๐Ÿฌ Glucose (Cโ‚†Hโ‚โ‚‚Oโ‚†)
Simple sugar - primary energy source for cells
๐Ÿง‚ Sodium Chloride (NaCl)
Common table salt - essential electrolyte
โš—๏ธ Sulfuric Acid (Hโ‚‚SOโ‚„)
Industrial workhorse - most produced chemical
โ˜• Caffeine (Cโ‚ˆHโ‚โ‚€Nโ‚„Oโ‚‚)
Central nervous system stimulant found in coffee
๐Ÿ’Š Aspirin (Cโ‚‰Hโ‚ˆOโ‚„)
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.

๐Ÿ“‹ Key Takeaways

  • โ€ข M = ฮฃ(n ร— A) | Sum atomic masses ร— atom counts
  • โ€ข n = m/M | Moles from mass; m = n ร— M
  • โ€ข % = (element mass / M) ร— 100 | Percent composition
  • โ€ข 1 mol = 6.022ร—10ยฒยณ | Avogadro's number

Did You Know?

๐Ÿ’ง

Hโ‚‚O = 18.015 g/mol; NaCl = 58.44 g/mol.

Source: IUPAC

๐Ÿฌ

Glucose Cโ‚†Hโ‚โ‚‚Oโ‚† = 180.16 g/mol.

Source: Biochemistry

โš›๏ธ

Molar mass = molecular weight in g/mol.

Source: Stoichiometry

๐Ÿ“

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

Source: Parser

๐Ÿงช

Essential for stoichiometry and solution prep.

Source: Lab

๐Ÿ“Š

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 ร— atomic mass for each element.

Formula

M = ฮฃ(n ร— A)

Moles

n = m/M; m = n ร— M

Expert Tips

Subscripts

H2O not Hโ‚‚O; C6H12O6.

Parentheses

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

Hydrates

CuSO4ยท5H2O.

IUPAC

Uses standard atomic weights.

Common Compounds (g/mol)

CompoundM (g/mol)
Hโ‚‚O18.015
NaCl58.44
Cโ‚†Hโ‚โ‚‚Oโ‚†180.16
COโ‚‚44.01

FAQ

What is molar mass?

Mass of 1 mole in g/mol. M = ฮฃ(n ร— atomic mass).

Molar mass vs molecular weight?

Same value; g/mol vs amu.

How to enter hydrates?

CuSO4ยท5H2O or CuSO4.5H2O.

Percent composition?

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

Moles from mass?

n = m / M.

Avogadro number?

6.022ร—10ยฒยณ particles per mole.

Key Numbers

6.022ร—10ยฒยณ
Avogadro
18.015
Hโ‚‚O (g/mol)
58.44
NaCl (g/mol)
180.16
Glucose (g/mol)

๐Ÿ“š Official Sources

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

โš ๏ธ Disclaimer: Uses IUPAC atomic weights. Consult CIAAW and NIST for precise data.

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