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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeNaMgCa100TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr is 5245.8600 g/mol

Convert between HLiBeNaMgCa100TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr weight and moles
CompoundMolesWeight, g
HLiBeNaMgCa100TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr

Elemental composition of HLiBeNaMgCa100TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0192
LithiumLi6.94110.1323
BerylliumBe9.01218210.1718
SodiumNa22.9897692810.4382
MagnesiumMg24.305010.4633
CalciumCa40.07810076.3993
TitaniumTi47.86710.9125
VanadiumV50.941510.9711
ChromiumCr51.996110.9912
ManganeseMn54.93804511.0473
IronFe55.84511.0646
CobaltCo58.93319511.1234
NickelNi58.693411.1189
CopperCu63.54611.2114
ZincZn65.3811.2463
GalliumGa69.72311.3291
AluminumAl26.981538610.5143
BoronB10.81110.2061
CarbonC12.010710.2290
NitrogenN14.006710.2670
OxygenO15.999410.3050
FluorineF18.998403210.3622
NeonNe20.179710.3847
HeliumHe4.00260210.0763
ArgonAr39.94810.7615
ChlorineCl35.45310.6758
SulfurS32.06510.6112
PhosphorusP30.97376210.5904
SiliconSi28.085510.5354
GermaniumGe72.6411.3847
ArsenicAs74.9216011.4282
SeleniumSe78.9611.5052
BromineBr79.90411.5232

Computing molar mass step by step

First, compute the number of each atom in HLiBeNaMgCa100TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr:
H: 1, Li: 1, Be: 1, Na: 1, Mg: 1, Ca: 100, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1, Ni: 1, Cu: 1, Zn: 1, Ga: 1, Al: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, He: 1, Ar: 1, Cl: 1, S: 1, P: 1, Si: 1, Ge: 1, As: 1, Se: 1, Br: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Li: 6.941, Be: 9.012182, Na: 22.98976928, Mg: 24.305, Ca: 40.078, 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, Al: 26.9815386, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, He: 4.002602, Ar: 39.948, Cl: 35.453, S: 32.065, P: 30.973762, Si: 28.0855, Ge: 72.64, As: 74.9216, Se: 78.96, Br: 79.904

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HLiBeNaMgCa100TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Ca) * Weight(Ca) + 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(Al) * Weight(Al) + 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(He) * Weight(He) + Count(Ar) * Weight(Ar) + Count(Cl) * Weight(Cl) + Count(S) * Weight(S) + Count(P) * Weight(P) + Count(Si) * Weight(Si) + Count(Ge) * Weight(Ge) + Count(As) * Weight(As) + Count(Se) * Weight(Se) + Count(Br) * Weight(Br) =
1 * 1.00794 + 1 * 6.941 + 1 * 9.012182 + 1 * 22.98976928 + 1 * 24.305 + 100 * 40.078 + 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 * 26.9815386 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 4.002602 + 1 * 39.948 + 1 * 35.453 + 1 * 32.065 + 1 * 30.973762 + 1 * 28.0855 + 1 * 72.64 + 1 * 74.9216 + 1 * 78.96 + 1 * 79.904 =
5245.8600 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeBrCa100ClCoCrCuFFeGaGeHeLiMgMnNNaNeNiOPSSeSiTiVZn

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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