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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPo is 2679.9033 g/mol

Convert between OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPo weight and moles
CompoundMolesWeight, g
OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPo

Elemental composition of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPo
ElementSymbolAtomic weightAtomsMass percent
OxygenO15.999410.5970
SulfurS32.06511.1965
FluorineF18.998403210.7089
NitrogenN14.006710.5227
ArgonAr39.94811.4907
PotassiumK39.098311.4589
NeonNe20.179710.7530
LithiumLi6.94110.2590
NiobiumNb92.9063813.4668
IronFe55.84512.0838
BoronB10.81110.4034
BromineBr79.90412.9816
RhodiumRh102.9055013.8399
PalladiumPd106.4213.9710
SilverAg107.868214.0251
HydrogenH1.0079410.0376
TechnetiumTc96.90636513.6160
OsmiumOs190.2317.0984
IridiumIr192.21717.1725
PlatinumPt195.08417.2795
RoentgeniumRg280.1645110.4543
FleroviumFl289.1873110.7910
UraniumU238.0289118.8820
ChromiumCr51.996111.9402
CobaltCo58.93319512.1991
CopperCu63.54612.3712
GalliumGa69.72312.6017
PoloniumPo208.98243017.7981

Computing molar mass step by step

First, compute the number of each atom in OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPo:
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

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

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPo) = ∑ 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) =
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 =
2679.9033 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgArBBrCoCrCuFFeFlGaHIrKLiNNbNeOOsPdPoPtRgRhSTcU

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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