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Molar Mass, Molecular Weight and Elemental Composition Calculator


Molar mass of MnCl2 is 125.8440 g/mol
Compound name is manganese(ii) chloride

Convert between MnCl2 weight and moles
CompoundMolesWeight, g
MnCl2

Elemental composition of MnCl2
ElementSymbolAtomic weightAtomsMass percent
ManganeseMn54.938045143.6557
ChlorineCl35.453256.3443

Mass percent compositionAtomic percent composition

Sample reactions for MnCl2
EquationReaction type
MnCl2 + Al = Mn + AlCl3single replacement
Na3PO4 + MnCl2 = NaCl + Mn3(PO4)2double replacement
H2S + MnCl2 = MnS + HCldouble replacement
Na2CO3 + MnCl2 = NaCl + MnCO3double replacement
MnCl2 + NaOH = Mn(OH)2 + NaCldouble replacement

Formula in Hill system is Cl2Mn

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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