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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeNaMgKCa10TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr is 1677.9383 g/mol

Convert between HLiBeNaMgKCa10TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr weight and moles
CompoundMolesWeight, g
HLiBeNaMgKCa10TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr

Elemental composition of HLiBeNaMgKCa10TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0601
LithiumLi6.94110.4137
BerylliumBe9.01218210.5371
SodiumNa22.9897692811.3701
MagnesiumMg24.305011.4485
PotassiumK39.098312.3301
CalciumCa40.0781023.8853
TitaniumTi47.86712.8527
VanadiumV50.941513.0360
ChromiumCr51.996113.0988
ManganeseMn54.93804513.2741
IronFe55.84513.3282
CobaltCo58.93319513.5122
NickelNi58.693413.4979
CopperCu63.54613.7871
ZincZn65.3813.8964
GalliumGa69.72314.1553
AluminumAl26.981538611.6080
BoronB10.81110.6443
CarbonC12.010710.7158
NitrogenN14.006710.8348
OxygenO15.999410.9535
FluorineF18.998403211.1322
NeonNe20.179711.2026
HeliumHe4.00260210.2385
ArgonAr39.94812.3808
ChlorineCl35.45312.1129
SulfurS32.06511.9110
PhosphorusP30.97376211.8459
SiliconSi28.085511.6738
GermaniumGe72.6414.3291
ArsenicAs74.9216014.4651
SeleniumSe78.9614.7058
BromineBr79.90414.7620

Computing molar mass step by step

First, compute the number of each atom in HLiBeNaMgKCa10TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr:
H: 1, Li: 1, Be: 1, Na: 1, Mg: 1, K: 1, Ca: 10, 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, K: 39.0983, 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 (HLiBeNaMgKCa10TiVCrMnFeCoNiCuZnGaAlBCNOFNeHeArClSPSiGeAsSeBr) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(K) * Weight(K) + 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 + 1 * 39.0983 + 10 * 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 =
1677.9383 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeBrCa10ClCoCrCuFFeGaGeHeKLiMgMnNNaNeNiOPSSeSiTiVZn

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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