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Molar Mass, Molecular Weight and Elemental Composition Calculator


Molar mass of K2SO4 is 174.2592 g/mol
Compound name is potassium sulfate

Convert between K2SO4 weight and moles
CompoundMolesWeight, g
K2SO4

Elemental composition of K2SO4
ElementSymbolAtomic weightAtomsMass percent
PotassiumK39.0983244.8737
SulfurS32.065118.4008
OxygenO15.9994436.7255

Mass percent compositionAtomic percent composition

Sample reactions for K2SO4
EquationReaction type
AlBr3 + K2SO4 = KBr + Al2(SO4)3double replacement
K2SO4 + BaCl2 = BaSO4 + KCldouble replacement
AgNO3 + K2SO4 = Ag2SO4 + KNO3double replacement
Ba(NO3)2 + K2SO4 = BaSO4 + KNO3double replacement
Pb(NO3)2 + K2SO4 = PbSO4 + KNO3double replacement

Formula in Hill system is K2O4S

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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