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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVMnFeCoNiCuZnGaGeAsSeBrKr is 1388.9836 g/mol

Convert between LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVMnFeCoNiCuZnGaGeAsSeBrKr weight and moles
CompoundMolesWeight, g
LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVMnFeCoNiCuZnGaGeAsSeBrKr

Elemental composition of LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVMnFeCoNiCuZnGaGeAsSeBrKr
ElementSymbolAtomic weightAtomsMass percent
LithiumLi6.94110.4997
BerylliumBe9.01218210.6488
BoronB10.81110.7783
CarbonC12.010710.8647
NitrogenN14.006711.0084
OxygenO15.999411.1519
FluorineF18.998403211.3678
NeonNe20.179711.4528
SodiumNa22.9897692811.6552
MagnesiumMg24.305011.7498
AluminumAl26.981538611.9425
SiliconSi28.085512.0220
PhosphorusP30.97376212.2300
SulfurS32.06512.3085
ChlorineCl35.45312.5524
ArgonAr39.94812.8761
PotassiumK39.098312.8149
CalciumCa40.07812.8854
ScandiumSc44.95591213.2366
TitaniumTi47.86713.4462
VanadiumV50.941513.6675
ManganeseMn54.93804513.9553
IronFe55.84514.0206
CobaltCo58.93319514.2429
NickelNi58.693414.2256
CopperCu63.54614.5750
ZincZn65.3814.7070
GalliumGa69.72315.0197
GermaniumGe72.6415.2297
ArsenicAs74.9216015.3940
SeleniumSe78.9615.6847
BromineBr79.90415.7527
KryptonKr83.79816.0330

Computing molar mass step by step

First, compute the number of each atom in LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVMnFeCoNiCuZnGaGeAsSeBrKr:
Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Na: 1, Mg: 1, Al: 1, Si: 1, P: 1, S: 1, Cl: 1, Ar: 1, K: 1, Ca: 1, Sc: 1, Ti: 1, V: 1, Mn: 1, Fe: 1, Co: 1, Ni: 1, Cu: 1, Zn: 1, Ga: 1, Ge: 1, As: 1, Se: 1, Br: 1, Kr: 1

Then, lookup atomic weights for each element in periodic table:
Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Mn: 54.938045, Fe: 55.845, Co: 58.933195, Ni: 58.6934, Cu: 63.546, Zn: 65.38, Ga: 69.723, Ge: 72.64, As: 74.9216, Se: 78.96, Br: 79.904, Kr: 83.798

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVMnFeCoNiCuZnGaGeAsSeBrKr) = ∑ Counti * Weighti =
Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + Count(Ti) * Weight(Ti) + Count(V) * Weight(V) + Count(Mn) * Weight(Mn) + Count(Fe) * Weight(Fe) + Count(Co) * Weight(Co) + Count(Ni) * Weight(Ni) + Count(Cu) * Weight(Cu) + Count(Zn) * Weight(Zn) + Count(Ga) * Weight(Ga) + Count(Ge) * Weight(Ge) + Count(As) * Weight(As) + Count(Se) * Weight(Se) + Count(Br) * Weight(Br) + Count(Kr) * Weight(Kr) =
1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 1 * 39.948 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 50.9415 + 1 * 54.938045 + 1 * 55.845 + 1 * 58.933195 + 1 * 58.6934 + 1 * 63.546 + 1 * 65.38 + 1 * 69.723 + 1 * 72.64 + 1 * 74.9216 + 1 * 78.96 + 1 * 79.904 + 1 * 83.798 =
1388.9836 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CAlArAsBBeBrCaClCoCuFFeGaGeKKrLiMgMnNNaNeNiOPSScSeSiTiVZn

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, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
  • parenthesis () or brackets [].
  • Common compound names.
Examples of molar mass computations: NaCl, Ca(OH)2, K4[Fe(CN)6], CuSO4*5H2O, nitric acid, potassium permanganate, ethanol, fructose, caffeine, water.

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

  • 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.
  • Mole is a standard scientific unit for measuring large quantities of very small entities such as atoms and molecules. One mole contains exactly 6.022 ×1023 particles (Avogadro's number)

Steps to calculate molar mass

  1. Identify the compound: write down the chemical formula of the compound. For example, water is H2O, meaning it contains two hydrogen atoms and one oxygen atom.
  2. Find atomic masses: look up the atomic masses of each element present in the compound. The atomic mass is usually found on the periodic table and is given in atomic mass units (amu).
  3. Calculate molar mass of each element: multiply the atomic mass of each element by the number of atoms of that element in the compound.
  4. Add them together: add the results from step 3 to get the total molar mass of the compound.

Example: calculating molar mass

Let's calculate the molar mass of carbon dioxide (CO2):

  • Carbon (C) has an atomic mass of about 12.01 amu.
  • Oxygen (O) has an atomic mass of about 16.00 amu.
  • CO2 has one carbon atom and two oxygen atoms.
  • The molar mass of carbon dioxide is 12.01 + (2 × 16.00) = 44.01 g/mol.

Lesson on computing molar mass

Weights of atoms and isotopes are from NIST article.

Related: Molecular weights of amino acids

molecular weights calculated today
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