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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgTs is 3470.4542 g/mol

Convert between OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgTs weight and moles
CompoundMolesWeight, g
OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgTs

Elemental composition of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgTs
ElementSymbolAtomic weightAtomsMass percent
OxygenO15.999410.4610
SulfurS32.06510.9239
FluorineF18.998403210.5474
NitrogenN14.006710.4036
ArgonAr39.94811.1511
PotassiumK39.098311.1266
NeonNe20.179710.5815
LithiumLi6.94110.2000
NiobiumNb92.9063812.6771
IronFe55.84511.6092
BoronB10.81110.3115
BromineBr79.90412.3024
RhodiumRh102.9055012.9652
PalladiumPd106.4213.0665
SilverAg107.868213.1082
HydrogenH1.0079410.0290
TechnetiumTc96.90636512.7923
OsmiumOs190.2315.4814
IridiumIr192.21715.5387
PlatinumPt195.08415.6213
RoentgeniumRg280.164518.0728
FleroviumFl289.187318.3328
UraniumU238.0289116.8587
ChromiumCr51.996111.4983
CobaltCo58.93319511.6981
CopperCu63.54611.8311
GalliumGa69.72312.0090
PoloniumPo208.98243016.0218
LanthanumLa138.9054714.0025
HafniumHf178.4915.1431
TantalumTa180.9478815.2140
OganessonOg0.000000010.0000
TennessineTs292.20818.4199

Computing molar mass step by step

First, compute the number of each atom in OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgTs:
O: 1, S: 1, F: 1, N: 1, Ar: 1, K: 1, Ne: 1, Li: 1, Nb: 1, Fe: 1, B: 1, Br: 1, Rh: 1, Pd: 1, Ag: 1, H: 1, Tc: 1, Os: 1, Ir: 1, Pt: 1, Rg: 1, Fl: 1, U: 1, Cr: 1, Co: 1, Cu: 1, Ga: 1, Po: 1, La: 1, Hf: 1, Ta: 1, Og: 1, Ts: 1

Then, lookup atomic weights for each element in periodic table:
O: 15.9994, S: 32.065, F: 18.9984032, N: 14.0067, Ar: 39.948, K: 39.0983, Ne: 20.1797, Li: 6.941, Nb: 92.90638, Fe: 55.845, B: 10.811, Br: 79.904, Rh: 102.9055, Pd: 106.42, Ag: 107.8682, H: 1.00794, Tc: 96.906365, Os: 190.23, Ir: 192.217, Pt: 195.084, Rg: 280.16447, Fl: 289.18728, U: 238.02891, Cr: 51.9961, Co: 58.933195, Cu: 63.546, Ga: 69.723, Po: 208.9824304, La: 138.90547, Hf: 178.49, Ta: 180.94788, Og: 0, Ts: 292.20755

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgTs) = ∑ Counti * Weighti =
Count(O) * Weight(O) + Count(S) * Weight(S) + Count(F) * Weight(F) + Count(N) * Weight(N) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + Count(Ne) * Weight(Ne) + Count(Li) * Weight(Li) + Count(Nb) * Weight(Nb) + Count(Fe) * Weight(Fe) + Count(B) * Weight(B) + Count(Br) * Weight(Br) + Count(Rh) * Weight(Rh) + Count(Pd) * Weight(Pd) + Count(Ag) * Weight(Ag) + Count(H) * Weight(H) + Count(Tc) * Weight(Tc) + Count(Os) * Weight(Os) + Count(Ir) * Weight(Ir) + Count(Pt) * Weight(Pt) + Count(Rg) * Weight(Rg) + Count(Fl) * Weight(Fl) + Count(U) * Weight(U) + Count(Cr) * Weight(Cr) + Count(Co) * Weight(Co) + Count(Cu) * Weight(Cu) + Count(Ga) * Weight(Ga) + Count(Po) * Weight(Po) + Count(La) * Weight(La) + Count(Hf) * Weight(Hf) + Count(Ta) * Weight(Ta) + Count(Og) * Weight(Og) + Count(Ts) * Weight(Ts) =
1 * 15.9994 + 1 * 32.065 + 1 * 18.9984032 + 1 * 14.0067 + 1 * 39.948 + 1 * 39.0983 + 1 * 20.1797 + 1 * 6.941 + 1 * 92.90638 + 1 * 55.845 + 1 * 10.811 + 1 * 79.904 + 1 * 102.9055 + 1 * 106.42 + 1 * 107.8682 + 1 * 1.00794 + 1 * 96.906365 + 1 * 190.23 + 1 * 192.217 + 1 * 195.084 + 1 * 280.16447 + 1 * 289.18728 + 1 * 238.02891 + 1 * 51.9961 + 1 * 58.933195 + 1 * 63.546 + 1 * 69.723 + 1 * 208.9824304 + 1 * 138.90547 + 1 * 178.49 + 1 * 180.94788 + 1 * 0 + 1 * 292.20755 =
3470.4542 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgArBBrCoCrCuFFeFlGaHHfIrKLaLiNNbNeOOgOsPdPoPtRgRhSTaTcTsU

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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