#### Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Al2S3 is 150.1581 g/mol
Convert between Al2S3 weight and moles
CompoundMolesWeight, g
Al2S3

Elemental composition of Al2S3
ElementSymbolAtomic weightAtomsMass percent
AluminumAl26.9815386235.9375
SulfurS32.065364.0625

Mass percent compositionAtomic percent composition

Sample reactions for Al2S3
EquationReaction type
Al2S3 + H2O = Al(OH)3 + H2Sdouble replacement
Al2S3 = Al + S8decomposition
Al2S3 + O2 = Al2O3 + SO2double replacement
Al2S3 + HCl = AlCl3 + H2Sdouble replacement
BaCl2 + Al2S3 = BaS + AlCl3double replacement

Formula in Hill system is Al2S3

### Computing molar mass (molar weight)

To calculate molar mass of a chemical compound enter its formula and click 'Compute'. In chemical formula you may use:
• Any chemical element. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al.
• Functional groups: D, Ph, Me, Et, Bu, AcAc, For, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
• parantesis () or brackets [].
• Common compound names.
Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, water, nitric acid, potassium permanganate, ethanol, fructose.

Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows to convert from weight to number of moles and vice versa.

### 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.

Related: Molecular weights of amino acids
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