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Molar Mass, Molecular Weight and Elemental Composition Calculator


Molar mass of LiBeBCNOFNeNaMgAlSiPSClAr is 348.7607 g/mol
Formula in Hill system is CAlArBBeClFLiMgNNaNeOPSSi
Elemental composition of LiBeBCNOFNeNaMgAlSiPSClAr:
SymbolElementAtomic weightAtomsMass percent
LiLithium6.94111.9902 %
BeBeryllium9.01218212.5841 %
BBoron10.81113.0998 %
CCarbon12.010713.4438 %
NNitrogen14.006714.0161 %
OOxygen15.999414.5875 %
FFluorine18.998403215.4474 %
NeNeon20.179715.7861 %
NaSodium22.9897692816.5918 %
MgMagnesium24.305016.9690 %
AlAluminum26.981538617.7364 %
SiSilicon28.085518.0529 %
PPhosphorus30.97376218.8811 %
SSulfur32.06519.1940 %
ClChlorine35.453110.1654 %
ArArgon39.948111.4543 %
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Computing molar mass (molar weight)

To calculate molar mass of a chemical compound enter its formula and click 'Calculate!'. In chemical formula you may use:
  • Any chemical element
  • 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.

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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