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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of (LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeSeBrKr)9 is 12294.5230 g/mol

Convert between (LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeSeBrKr)9 weight and moles
CompoundMolesWeight, g
(LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeSeBrKr)9

Elemental composition of (LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeSeBrKr)9
ElementSymbolAtomic weightAtomsMass percent
LithiumLi6.94190.5081
BerylliumBe9.01218290.6597
BoronB10.81190.7914
CarbonC12.010790.8792
NitrogenN14.006791.0253
OxygenO15.999491.1712
FluorineF18.998403291.3907
NeonNe20.179791.4772
SodiumNa22.9897692891.6829
MagnesiumMg24.305091.7792
AluminumAl26.981538691.9751
SiliconSi28.085592.0560
PhosphorusP30.97376292.2674
SulfurS32.06592.3473
ChlorineCl35.45392.5953
ArgonAr39.94892.9243
PotassiumK39.098392.8621
CalciumCa40.07892.9338
ScandiumSc44.95591293.2909
TitaniumTi47.86793.5040
VanadiumV50.941593.7291
ChromiumCr51.996193.8063
ManganeseMn54.93804594.0216
IronFe55.84594.0880
CobaltCo58.93319594.3141
NickelNi58.693494.2966
CopperCu63.54694.6518
ZincZn65.3894.7860
GalliumGa69.72395.1040
GermaniumGe72.6495.3175
SeleniumSe78.9695.7801
BromineBr79.90495.8492
KryptonKr83.79896.1343

Computing molar mass step by step

First, compute the number of each atom in (LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeSeBrKr)9:
Li: 9, Be: 9, B: 9, C: 9, N: 9, O: 9, F: 9, Ne: 9, Na: 9, Mg: 9, Al: 9, Si: 9, P: 9, S: 9, Cl: 9, Ar: 9, K: 9, Ca: 9, Sc: 9, Ti: 9, V: 9, Cr: 9, Mn: 9, Fe: 9, Co: 9, Ni: 9, Cu: 9, Zn: 9, Ga: 9, Ge: 9, Se: 9, Br: 9, Kr: 9

Then, lookup atomic weights for each element in periodic table:
Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Cr: 51.9961, Mn: 54.938045, Fe: 55.845, Co: 58.933195, Ni: 58.6934, Cu: 63.546, Zn: 65.38, Ga: 69.723, Ge: 72.64, Se: 78.96, Br: 79.904, Kr: 83.798

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass ((LiBeBCNOFNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeSeBrKr)9) = ∑ Counti * Weighti =
Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + Count(Ti) * Weight(Ti) + Count(V) * Weight(V) + Count(Cr) * Weight(Cr) + Count(Mn) * Weight(Mn) + Count(Fe) * Weight(Fe) + Count(Co) * Weight(Co) + Count(Ni) * Weight(Ni) + Count(Cu) * Weight(Cu) + Count(Zn) * Weight(Zn) + Count(Ga) * Weight(Ga) + Count(Ge) * Weight(Ge) + Count(Se) * Weight(Se) + Count(Br) * Weight(Br) + Count(Kr) * Weight(Kr) =
9 * 6.941 + 9 * 9.012182 + 9 * 10.811 + 9 * 12.0107 + 9 * 14.0067 + 9 * 15.9994 + 9 * 18.9984032 + 9 * 20.1797 + 9 * 22.98976928 + 9 * 24.305 + 9 * 26.9815386 + 9 * 28.0855 + 9 * 30.973762 + 9 * 32.065 + 9 * 35.453 + 9 * 39.948 + 9 * 39.0983 + 9 * 40.078 + 9 * 44.955912 + 9 * 47.867 + 9 * 50.9415 + 9 * 51.9961 + 9 * 54.938045 + 9 * 55.845 + 9 * 58.933195 + 9 * 58.6934 + 9 * 63.546 + 9 * 65.38 + 9 * 69.723 + 9 * 72.64 + 9 * 78.96 + 9 * 79.904 + 9 * 83.798 =
12294.5230 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C9Al9Ar9B9Be9Br9Ca9Cl9Co9Cr9Cu9F9Fe9Ga9Ge9K9Kr9Li9Mg9Mn9N9Na9Ne9Ni9O9P9S9Sc9Se9Si9Ti9V9Zn9

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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