Printed from https://www.webqc.org

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLa is 2818.8087 g/mol

Convert between OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLa weight and moles
CompoundMolesWeight, g
OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLa

Elemental composition of OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLa
ElementSymbolAtomic weightAtomsMass percent
OxygenO15.999410.5676
SulfurS32.06511.1375
FluorineF18.998403210.6740
NitrogenN14.006710.4969
ArgonAr39.94811.4172
PotassiumK39.098311.3871
NeonNe20.179710.7159
LithiumLi6.94110.2462
NiobiumNb92.9063813.2959
IronFe55.84511.9812
BoronB10.81110.3835
BromineBr79.90412.8347
RhodiumRh102.9055013.6507
PalladiumPd106.4213.7754
SilverAg107.868213.8267
HydrogenH1.0079410.0358
TechnetiumTc96.90636513.4378
OsmiumOs190.2316.7486
IridiumIr192.21716.8191
PlatinumPt195.08416.9208
RoentgeniumRg280.164519.9391
FleroviumFl289.1873110.2592
UraniumU238.0289118.4443
ChromiumCr51.996111.8446
CobaltCo58.93319512.0907
CopperCu63.54612.2544
GalliumGa69.72312.4735
PoloniumPo208.98243017.4139
LanthanumLa138.9054714.9278

Computing molar mass step by step

First, compute the number of each atom in OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLa:
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

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

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (OSFNArKNeLiNbFeBBrRhPdAgHTcOsIrPtRgFlUCrCoCuGaPoLa) = ∑ 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) =
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 =
2818.8087 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgArBBrCoCrCuFFeFlGaHIrKLaLiNNbNeOOsPdPoPtRgRhSTcU

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
Please let us know how we can improve this web app.
Menu Balance Molar mass Gas laws Units Chemistry tools Periodic table Chemical forum Symmetry Constants Contribute Contact us
How to cite?
Choose languageDeutschEnglishEspañolFrançaisItalianoNederlandsPolskiPortuguêsРусский中文日本語한국어