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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSb is 3300.0066 g/mol

Convert between OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSb weight and moles
CompoundMolesWeight, g
OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSb

Elemental composition of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSb
ElementSymbolAtomic weightAtomsMass percent
OxygenO15.999410.4848
SulfurS32.06510.9717
FluorineF18.998403210.5757
NitrogenN14.006710.4244
ArgonAr39.94811.2105
PotassiumK39.098311.1848
NeonNe20.179710.6115
LithiumLi6.94110.2103
NiobiumNb92.9063812.8153
IronFe55.84511.6923
BoronB10.81110.3276
BromineBr79.90412.4213
RhodiumRh102.9055013.1183
PalladiumPd106.4213.2248
SilverAg107.868213.2687
HydrogenH1.0079410.0305
TechnetiumTc96.90636512.9366
OsmiumOs190.2315.7645
IridiumIr192.21715.8247
PlatinumPt195.08415.9116
RoentgeniumRg280.164518.4898
FleroviumFl289.187318.7632
UraniumU238.0289117.2130
ChromiumCr51.996111.5756
CobaltCo58.93319511.7859
CopperCu63.54611.9256
GalliumGa69.72312.1128
PoloniumPo208.98243016.3328
LanthanumLa138.9054714.2092
HafniumHf178.4915.4088
TantalumTa180.9478815.4833
OganessonOg0.000000010.0000
AntimonySb121.76013.6897

Computing molar mass step by step

First, compute the number of each atom in OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSb:
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, Sb: 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, Sb: 121.76

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSb) = ∑ 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(Sb) * Weight(Sb) =
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 * 121.76 =
3300.0066 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgArBBrCoCrCuFFeFlGaHHfIrKLaLiNNbNeOOgOsPdPoPtRgRhSSbTaTcU

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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