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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of KAlBOCClFIHeRaUTcPaAgBeSiBrCaSrLaHWNiCuFeCrYbZrAsSeMoCeTaVTa is 3055.7306 g/mol

Convert between KAlBOCClFIHeRaUTcPaAgBeSiBrCaSrLaHWNiCuFeCrYbZrAsSeMoCeTaVTa weight and moles
CompoundMolesWeight, g
KAlBOCClFIHeRaUTcPaAgBeSiBrCaSrLaHWNiCuFeCrYbZrAsSeMoCeTaVTa

Elemental composition of KAlBOCClFIHeRaUTcPaAgBeSiBrCaSrLaHWNiCuFeCrYbZrAsSeMoCeTaVTa
ElementSymbolAtomic weightAtomsMass percent
PotassiumK39.098311.2795
AluminumAl26.981538610.8830
BoronB10.81110.3538
OxygenO15.999410.5236
CarbonC12.010710.3931
ChlorineCl35.45311.1602
FluorineF18.998403210.6217
IodineI126.9044714.1530
HeliumHe4.00260210.1310
RadiumRa226.02541017.3968
UraniumU238.0289117.7896
TechnetiumTc96.90636513.1713
ProtactiniumPa231.0358817.5607
SilverAg107.868213.5300
BerylliumBe9.01218210.2949
SiliconSi28.085510.9191
BromineBr79.90412.6149
CalciumCa40.07811.3116
StrontiumSr87.6212.8674
LanthanumLa138.9054714.5457
HydrogenH1.0079410.0330
TungstenW183.8416.0162
NickelNi58.693411.9208
CopperCu63.54612.0796
IronFe55.84511.8275
ChromiumCr51.996111.7016
YtterbiumYb173.05415.6633
ZirconiumZr91.22412.9853
ArsenicAs74.9216012.4518
SeleniumSe78.9612.5840
MolybdenumMo95.9613.1403
CeriumCe140.11614.5854
TantalumTa180.94788211.8432
VanadiumV50.941511.6671

Computing molar mass step by step

First, compute the number of each atom in KAlBOCClFIHeRaUTcPaAgBeSiBrCaSrLaHWNiCuFeCrYbZrAsSeMoCeTaVTa:
K: 1, Al: 1, B: 1, O: 1, C: 1, Cl: 1, F: 1, I: 1, He: 1, Ra: 1, U: 1, Tc: 1, Pa: 1, Ag: 1, Be: 1, Si: 1, Br: 1, Ca: 1, Sr: 1, La: 1, H: 1, W: 1, Ni: 1, Cu: 1, Fe: 1, Cr: 1, Yb: 1, Zr: 1, As: 1, Se: 1, Mo: 1, Ce: 1, Ta: 2, V: 1

Then, lookup atomic weights for each element in periodic table:
K: 39.0983, Al: 26.9815386, B: 10.811, O: 15.9994, C: 12.0107, Cl: 35.453, F: 18.9984032, I: 126.90447, He: 4.002602, Ra: 226.0254098, U: 238.02891, Tc: 96.906365, Pa: 231.03588, Ag: 107.8682, Be: 9.012182, Si: 28.0855, Br: 79.904, Ca: 40.078, Sr: 87.62, La: 138.90547, H: 1.00794, W: 183.84, Ni: 58.6934, Cu: 63.546, Fe: 55.845, Cr: 51.9961, Yb: 173.054, Zr: 91.224, As: 74.9216, Se: 78.96, Mo: 95.96, Ce: 140.116, Ta: 180.94788, V: 50.9415

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (KAlBOCClFIHeRaUTcPaAgBeSiBrCaSrLaHWNiCuFeCrYbZrAsSeMoCeTaVTa) = ∑ Counti * Weighti =
Count(K) * Weight(K) + Count(Al) * Weight(Al) + Count(B) * Weight(B) + Count(O) * Weight(O) + Count(C) * Weight(C) + Count(Cl) * Weight(Cl) + Count(F) * Weight(F) + Count(I) * Weight(I) + Count(He) * Weight(He) + Count(Ra) * Weight(Ra) + Count(U) * Weight(U) + Count(Tc) * Weight(Tc) + Count(Pa) * Weight(Pa) + Count(Ag) * Weight(Ag) + Count(Be) * Weight(Be) + Count(Si) * Weight(Si) + Count(Br) * Weight(Br) + Count(Ca) * Weight(Ca) + Count(Sr) * Weight(Sr) + Count(La) * Weight(La) + Count(H) * Weight(H) + Count(W) * Weight(W) + Count(Ni) * Weight(Ni) + Count(Cu) * Weight(Cu) + Count(Fe) * Weight(Fe) + Count(Cr) * Weight(Cr) + Count(Yb) * Weight(Yb) + Count(Zr) * Weight(Zr) + Count(As) * Weight(As) + Count(Se) * Weight(Se) + Count(Mo) * Weight(Mo) + Count(Ce) * Weight(Ce) + Count(Ta) * Weight(Ta) + Count(V) * Weight(V) =
1 * 39.0983 + 1 * 26.9815386 + 1 * 10.811 + 1 * 15.9994 + 1 * 12.0107 + 1 * 35.453 + 1 * 18.9984032 + 1 * 126.90447 + 1 * 4.002602 + 1 * 226.0254098 + 1 * 238.02891 + 1 * 96.906365 + 1 * 231.03588 + 1 * 107.8682 + 1 * 9.012182 + 1 * 28.0855 + 1 * 79.904 + 1 * 40.078 + 1 * 87.62 + 1 * 138.90547 + 1 * 1.00794 + 1 * 183.84 + 1 * 58.6934 + 1 * 63.546 + 1 * 55.845 + 1 * 51.9961 + 1 * 173.054 + 1 * 91.224 + 1 * 74.9216 + 1 * 78.96 + 1 * 95.96 + 1 * 140.116 + 2 * 180.94788 + 1 * 50.9415 =
3055.7306 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAlAsBBeBrCaCeClCrCuFFeHeIKLaMoNiOPaRaSeSiSrTa2TcUVWYbZr

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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