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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of MgClOH is 76.7653 g/mol

Formula in Hill system is ClHMgO
Elemental composition of MgClOH:
SymbolElementAtomic weightAtomsMass percent
MgMagnesium24.3050131.6614 %
ClChlorine35.453146.1836 %
OOxygen15.9994120.8420 %
HHydrogen1.0079411.3130 %
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Computing molar mass (molar weight)

To calculate molar mass of a chemical compound enter it's 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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