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Molar Mass, Molecular Weight and Elemental Composition Calculator


Molar mass of Fe2(SO4)3 is 399.8778 g/mol
Convert between Fe2(SO4)3 weight and moles
CompoundMolesWeight, g
Fe2(SO4)3

Elemental composition of Fe2(SO4)3
ElementSymbolAtomic weightAtomsMass percent
IronFe55.845227.9310
SulfurS32.065324.0561
OxygenO15.99941248.0129

Mass percent compositionAtomic percent composition

Sample reactions for Fe2(SO4)3
EquationReaction type
Fe2(SO4)3 + KOH = K2SO4 + Fe(OH)3double replacement
Fe2(SO4)3 + KSCN = K3Fe(SCN)6 + K2SO4double replacement
Fe2(SO4)3 + Ba(OH)2 = Fe(OH)3 + BaSO4double replacement
Fe2(SO4)3 + K(SCN) = K3Fe(SCN)6 + K2SO4double replacement
Fe2(SO4)3 + BaCl2 = FeCl3 + BaSO4double replacement

Formula in Hill system is Fe2O12S3

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
molecular weights calculated today
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