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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSbTe is 3427.6066 g/mol

Convert between OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSbTe weight and moles
CompoundMolesWeight, g
OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSbTe

Elemental composition of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSbTe
ElementSymbolAtomic weightAtomsMass percent
OxygenO15.999410.4668
SulfurS32.06510.9355
FluorineF18.998403210.5543
NitrogenN14.006710.4086
ArgonAr39.94811.1655
PotassiumK39.098311.1407
NeonNe20.179710.5887
LithiumLi6.94110.2025
NiobiumNb92.9063812.7105
IronFe55.84511.6293
BoronB10.81110.3154
BromineBr79.90412.3312
RhodiumRh102.9055013.0023
PalladiumPd106.4213.1048
SilverAg107.868213.1470
HydrogenH1.0079410.0294
TechnetiumTc96.90636512.8272
OsmiumOs190.2315.5499
IridiumIr192.21715.6079
PlatinumPt195.08415.6916
RoentgeniumRg280.164518.1738
FleroviumFl289.187318.4370
UraniumU238.0289116.9445
ChromiumCr51.996111.5170
CobaltCo58.93319511.7194
CopperCu63.54611.8539
GalliumGa69.72312.0342
PoloniumPo208.98243016.0970
LanthanumLa138.9054714.0525
HafniumHf178.4915.2074
TantalumTa180.9478815.2791
OganessonOg0.000000010.0000
AntimonySb121.76013.5523
TelluriumTe127.6013.7227

Computing molar mass step by step

First, compute the number of each atom in OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSbTe:
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, Te: 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, Te: 127.6

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLaHfTaOgSbTe) = ∑ 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) + Count(Te) * Weight(Te) =
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 + 1 * 127.6 =
3427.6066 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgArBBrCoCrCuFFeFlGaHHfIrKLaLiNNbNeOOgOsPdPoPtRgRhSSbTaTcTeU

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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