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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCNOFNeNaMgAlBiSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeOs is 1622.4394 g/mol

Convert between HHeLiBeBCNOFNeNaMgAlBiSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeOs weight and moles
CompoundMolesWeight, g
HHeLiBeBCNOFNeNaMgAlBiSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeOs

Elemental composition of HHeLiBeBCNOFNeNaMgAlBiSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeOs
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0621
HeliumHe4.00260210.2467
LithiumLi6.94110.4278
BerylliumBe9.01218210.5555
BoronB10.81110.6663
CarbonC12.010710.7403
NitrogenN14.006710.8633
OxygenO15.999410.9861
FluorineF18.998403211.1710
NeonNe20.179711.2438
SodiumNa22.9897692811.4170
MagnesiumMg24.305011.4981
AluminumAl26.981538611.6630
BismuthBi208.98040112.8806
SulfurS32.06511.9763
ChlorineCl35.45312.1852
ArgonAr39.94812.4622
PotassiumK39.098312.4098
CalciumCa40.07812.4702
ScandiumSc44.95591212.7709
TitaniumTi47.86712.9503
VanadiumV50.941513.1398
ChromiumCr51.996113.2048
ManganeseMn54.93804513.3861
IronFe55.84513.4420
CobaltCo58.93319513.6324
NickelNi58.693413.6176
CopperCu63.54613.9167
ZincZn65.3814.0297
GalliumGa69.72314.2974
GermaniumGe72.6414.4772
ArsenicAs74.9216014.6178
SeleniumSe78.9614.8667
OsmiumOs190.23111.7249

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCNOFNeNaMgAlBiSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeOs:
H: 1, He: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Na: 1, Mg: 1, Al: 1, Bi: 1, S: 1, Cl: 1, Ar: 1, K: 1, Ca: 1, Sc: 1, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1, Ni: 1, Cu: 1, Zn: 1, Ga: 1, Ge: 1, As: 1, Se: 1, Os: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, 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, Bi: 208.9804, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Cr: 51.9961, 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, Os: 190.23

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCNOFNeNaMgAlBiSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeOs) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + 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(Bi) * Weight(Bi) + 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(Cr) * Weight(Cr) + 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(Os) * Weight(Os) =
1 * 1.00794 + 1 * 4.002602 + 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 * 208.9804 + 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 * 51.9961 + 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 * 190.23 =
1622.4394 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeBiCaClCoCrCuFFeGaGeHeKLiMgMnNNaNeNiOOsSScSeTiVZn

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, T, 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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