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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCaScTiVCrMnFeCuNiZnYZrNbMoTcRuRhPdAgCdLaHfTa111SO3Na is 22068.2561 g/mol

Convert between HHeLiBeBCaScTiVCrMnFeCuNiZnYZrNbMoTcRuRhPdAgCdLaHfTa111SO3Na weight and moles
CompoundMolesWeight, g
HHeLiBeBCaScTiVCrMnFeCuNiZnYZrNbMoTcRuRhPdAgCdLaHfTa111SO3Na

Elemental composition of HHeLiBeBCaScTiVCrMnFeCuNiZnYZrNbMoTcRuRhPdAgCdLaHfTa111SO3Na
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0046
HeliumHe4.00260210.0181
LithiumLi6.94110.0315
BerylliumBe9.01218210.0408
BoronB10.81110.0490
CalciumCa40.07810.1816
ScandiumSc44.95591210.2037
TitaniumTi47.86710.2169
VanadiumV50.941510.2308
ChromiumCr51.996110.2356
ManganeseMn54.93804510.2489
IronFe55.84510.2531
CopperCu63.54610.2880
NickelNi58.693410.2660
ZincZn65.3810.2963
YttriumY88.9058510.4029
ZirconiumZr91.22410.4134
NiobiumNb92.9063810.4210
MolybdenumMo95.9610.4348
TechnetiumTc96.90636510.4391
RutheniumRu101.0710.4580
RhodiumRh102.9055010.4663
PalladiumPd106.4210.4822
SilverAg107.868210.4888
CadmiumCd112.41110.5094
LanthanumLa138.9054710.6294
HafniumHf178.4910.8088
TantalumTa180.9478811191.0141
SulfurS32.06510.1453
OxygenO15.999430.2175
SodiumNa22.9897692810.1042

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCaScTiVCrMnFeCuNiZnYZrNbMoTcRuRhPdAgCdLaHfTa111SO3Na:
H: 1, He: 1, Li: 1, Be: 1, B: 1, Ca: 1, Sc: 1, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Cu: 1, Ni: 1, Zn: 1, Y: 1, Zr: 1, Nb: 1, Mo: 1, Tc: 1, Ru: 1, Rh: 1, Pd: 1, Ag: 1, Cd: 1, La: 1, Hf: 1, Ta: 111, S: 1, O: 3, Na: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, B: 10.811, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Cr: 51.9961, Mn: 54.938045, Fe: 55.845, Cu: 63.546, Ni: 58.6934, Zn: 65.38, Y: 88.90585, Zr: 91.224, Nb: 92.90638, Mo: 95.96, Tc: 96.906365, Ru: 101.07, Rh: 102.9055, Pd: 106.42, Ag: 107.8682, Cd: 112.411, La: 138.90547, Hf: 178.49, Ta: 180.94788, S: 32.065, O: 15.9994, Na: 22.98976928

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCaScTiVCrMnFeCuNiZnYZrNbMoTcRuRhPdAgCdLaHfTa111SO3Na) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + 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(Cu) * Weight(Cu) + Count(Ni) * Weight(Ni) + Count(Zn) * Weight(Zn) + Count(Y) * Weight(Y) + Count(Zr) * Weight(Zr) + Count(Nb) * Weight(Nb) + Count(Mo) * Weight(Mo) + Count(Tc) * Weight(Tc) + Count(Ru) * Weight(Ru) + Count(Rh) * Weight(Rh) + Count(Pd) * Weight(Pd) + Count(Ag) * Weight(Ag) + Count(Cd) * Weight(Cd) + Count(La) * Weight(La) + Count(Hf) * Weight(Hf) + Count(Ta) * Weight(Ta) + Count(S) * Weight(S) + Count(O) * Weight(O) + Count(Na) * Weight(Na) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 50.9415 + 1 * 51.9961 + 1 * 54.938045 + 1 * 55.845 + 1 * 63.546 + 1 * 58.6934 + 1 * 65.38 + 1 * 88.90585 + 1 * 91.224 + 1 * 92.90638 + 1 * 95.96 + 1 * 96.906365 + 1 * 101.07 + 1 * 102.9055 + 1 * 106.42 + 1 * 107.8682 + 1 * 112.411 + 1 * 138.90547 + 1 * 178.49 + 111 * 180.94788 + 1 * 32.065 + 3 * 15.9994 + 1 * 22.98976928 =
22068.2561 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgBBeCaCdCrCuFeHHeHfLaLiMnMoNaNbNiO3PdRhRuSScTa111TcTiVYZnZr

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, 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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