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CALCULATE MOLECULAR WEIGHT - MOLAR MASS CALCULATOR
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Enter a chemical formula to calculate its molar mass and elemental composition:
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Molar mass of Al2(SO4)3 is 342.1527 ± 0.0004 g/mol
Formula in Hill system is Al2O12S3 Elemental composition of Al2(SO4)3:
| Symbol | Element | Atomic weight | Number of atoms | Mass percent |
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| Al | Aluminum | 26.98153868 | 2 | 15.7716 % | | S | Sulfur | 32.0655 | 3 | 28.1151 % | | O | Oxygen | 15.99943 | 12 | 56.1133 % | Direct link to this page
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Computing molar mass (molar weight)
To calculate molar mass of a chemical compound enter it's formula and click 'Calculate!'.In chemical formula you may use:
- Any chemical element
- Functional groups: D, Ph, Me, Et, Pr, Bu, AcAc, Ac, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
- parantesis () or brackets [].
Examples of molar mass computations:
NaCl,
Ca(OH)2,
K4[Fe(CN)6].
CuSO4*5H2O.
Computing molecular weight (molecular mass)
To calculate molecular weight of a chemical compound enter it's formula, specify its isotope mass number after each element in square brackets.
Examples of molecular weight computations:
C[14]O[16]2,
S[34]O[16]2.
Definitions of molecular mass, molecular weight, molar mass and molar weight
- Molecular mass (molecular weight) is the mass of one molecule of a substance and is expressed in the unified atomic mass units (u). (1 u is equal to 1/12 the mass of one atom of carbon-12)
- Molar mass (molar weight) is the mass of one mole of a substance and is expressed in g/mol.
Weights of atoms and isotopes are from NIST article.
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