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Molar Mass, Molecular Weight and Elemental Composition Calculator


Molar mass of FeSO4 is 151.9076 g/mol
Convert between FeSO4 weight and moles
CompoundMolesWeight, g
FeSO4

Elemental composition of FeSO4
ElementSymbolAtomic weightAtomsMass percent
IronFe55.845136.7625
SulfurS32.065121.1082
OxygenO15.9994442.1293

Mass percent compositionAtomic percent composition

Sample reactions for FeSO4
EquationReaction type
FeSO4 + NaOH = Fe(OH)2 + Na2SO4double replacement
FeSO4 = Fe2O3 + SO2 + SO3decomposition
Cu + FeSO4 = CuSO4 + Fesingle replacement
Mg + FeSO4 = MgSO4 + Fesingle replacement
FeSO4 + (NH4)2S = FeS + (NH4)2SO4double replacement

Formula in Hill system is FeO4S

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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