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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AlPOIAgSFeNaBrTiCuZnKCO6SO2ClBeLiHBCNHeNeArSiSeKrXeAtPoBiPb is 2198.1526 g/mol

Convert between AlPOIAgSFeNaBrTiCuZnKCO6SO2ClBeLiHBCNHeNeArSiSeKrXeAtPoBiPb weight and moles
CompoundMolesWeight, g
AlPOIAgSFeNaBrTiCuZnKCO6SO2ClBeLiHBCNHeNeArSiSeKrXeAtPoBiPb

Elemental composition of AlPOIAgSFeNaBrTiCuZnKCO6SO2ClBeLiHBCNHeNeArSiSeKrXeAtPoBiPb
ElementSymbolAtomic weightAtomsMass percent
AluminumAl26.981538611.2275
PhosphorusP30.97376211.4091
OxygenO15.999496.5507
IodineI126.9044715.7732
SilverAg107.868214.9072
SulfurS32.06522.9174
IronFe55.84512.5405
SodiumNa22.9897692811.0459
BromineBr79.90413.6351
TitaniumTi47.86712.1776
CopperCu63.54612.8909
ZincZn65.3812.9743
PotassiumK39.098311.7787
CarbonC12.010721.0928
ChlorineCl35.45311.6129
BerylliumBe9.01218210.4100
LithiumLi6.94110.3158
HydrogenH1.0079410.0459
BoronB10.81110.4918
NitrogenN14.006710.6372
HeliumHe4.00260210.1821
NeonNe20.179710.9180
ArgonAr39.94811.8173
SiliconSi28.085511.2777
SeleniumSe78.9613.5921
KryptonKr83.79813.8122
XenonXe131.29315.9729
AstatineAt209.98714819.5529
PoloniumPo208.98243019.5072
BismuthBi208.9804019.5071
LeadPb207.219.4261

Computing molar mass step by step

First, compute the number of each atom in AlPOIAgSFeNaBrTiCuZnKCO6SO2ClBeLiHBCNHeNeArSiSeKrXeAtPoBiPb:
Al: 1, P: 1, O: 9, I: 1, Ag: 1, S: 2, Fe: 1, Na: 1, Br: 1, Ti: 1, Cu: 1, Zn: 1, K: 1, C: 2, Cl: 1, Be: 1, Li: 1, H: 1, B: 1, N: 1, He: 1, Ne: 1, Ar: 1, Si: 1, Se: 1, Kr: 1, Xe: 1, At: 1, Po: 1, Bi: 1, Pb: 1

Then, lookup atomic weights for each element in periodic table:
Al: 26.9815386, P: 30.973762, O: 15.9994, I: 126.90447, Ag: 107.8682, S: 32.065, Fe: 55.845, Na: 22.98976928, Br: 79.904, Ti: 47.867, Cu: 63.546, Zn: 65.38, K: 39.0983, C: 12.0107, Cl: 35.453, Be: 9.012182, Li: 6.941, H: 1.00794, B: 10.811, N: 14.0067, He: 4.002602, Ne: 20.1797, Ar: 39.948, Si: 28.0855, Se: 78.96, Kr: 83.798, Xe: 131.293, At: 209.987148, Po: 208.9824304, Bi: 208.9804, Pb: 207.2

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (AlPOIAgSFeNaBrTiCuZnKCO6SO2ClBeLiHBCNHeNeArSiSeKrXeAtPoBiPb) = ∑ Counti * Weighti =
Count(Al) * Weight(Al) + Count(P) * Weight(P) + Count(O) * Weight(O) + Count(I) * Weight(I) + Count(Ag) * Weight(Ag) + Count(S) * Weight(S) + Count(Fe) * Weight(Fe) + Count(Na) * Weight(Na) + Count(Br) * Weight(Br) + Count(Ti) * Weight(Ti) + Count(Cu) * Weight(Cu) + Count(Zn) * Weight(Zn) + Count(K) * Weight(K) + Count(C) * Weight(C) + Count(Cl) * Weight(Cl) + Count(Be) * Weight(Be) + Count(Li) * Weight(Li) + Count(H) * Weight(H) + Count(B) * Weight(B) + Count(N) * Weight(N) + Count(He) * Weight(He) + Count(Ne) * Weight(Ne) + Count(Ar) * Weight(Ar) + Count(Si) * Weight(Si) + Count(Se) * Weight(Se) + Count(Kr) * Weight(Kr) + Count(Xe) * Weight(Xe) + Count(At) * Weight(At) + Count(Po) * Weight(Po) + Count(Bi) * Weight(Bi) + Count(Pb) * Weight(Pb) =
1 * 26.9815386 + 1 * 30.973762 + 9 * 15.9994 + 1 * 126.90447 + 1 * 107.8682 + 2 * 32.065 + 1 * 55.845 + 1 * 22.98976928 + 1 * 79.904 + 1 * 47.867 + 1 * 63.546 + 1 * 65.38 + 1 * 39.0983 + 2 * 12.0107 + 1 * 35.453 + 1 * 9.012182 + 1 * 6.941 + 1 * 1.00794 + 1 * 10.811 + 1 * 14.0067 + 1 * 4.002602 + 1 * 20.1797 + 1 * 39.948 + 1 * 28.0855 + 1 * 78.96 + 1 * 83.798 + 1 * 131.293 + 1 * 209.987148 + 1 * 208.9824304 + 1 * 208.9804 + 1 * 207.2 =
2198.1526 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C2HAgAlArAtBBeBiBrClCuFeHeIKKrLiNNaNeO9PPbPoS2SeSiTiXeZn

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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