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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AcAgAlAmArAsAtAuBBaBeBhBiBkBrCCaCdCeCfClCmCoCrCsCuDbDyEr is 3827.4707 g/mol

Convert between AcAgAlAmArAsAtAuBBaBeBhBiBkBrCCaCdCeCfClCmCoCrCsCuDbDyEr weight and moles
CompoundMolesWeight, g
AcAgAlAmArAsAtAuBBaBeBhBiBkBrCCaCdCeCfClCmCoCrCsCuDbDyEr

Elemental composition of AcAgAlAmArAsAtAuBBaBeBhBiBkBrCCaCdCeCfClCmCoCrCsCuDbDyEr
ElementSymbolAtomic weightAtomsMass percent
ActiniumAc227.02775215.9315
SilverAg107.868212.8183
AluminumAl26.981538610.7049
AmericiumAm241.05682916.2981
ArgonAr39.94811.0437
ArsenicAs74.9216011.9575
AstatineAt209.98714815.4863
GoldAu196.96656915.1461
BoronB10.81110.2825
BariumBa137.32713.5879
BerylliumBe9.01218210.2355
BohriumBh272.138017.1101
BismuthBi208.9804015.4600
BerkeliumBk247.07030716.4552
BromineBr79.90412.0876
CarbonC12.010710.3138
CalciumCa40.07811.0471
CadmiumCd112.41112.9370
CeriumCe140.11613.6608
CaliforniumCf249.07485316.5076
ChlorineCl35.45310.9263
CuriumCm243.06138916.3504
CobaltCo58.93319511.5397
ChromiumCr51.996111.3585
CesiumCs132.905451913.4724
CopperCu63.54611.6603
DubniumDb268.125517.0053
DysprosiumDy162.50014.2456
ErbiumEr167.25914.3700

Computing molar mass step by step

First, compute the number of each atom in AcAgAlAmArAsAtAuBBaBeBhBiBkBrCCaCdCeCfClCmCoCrCsCuDbDyEr:
Ac: 1, Ag: 1, Al: 1, Am: 1, Ar: 1, As: 1, At: 1, Au: 1, B: 1, Ba: 1, Be: 1, Bh: 1, Bi: 1, Bk: 1, Br: 1, C: 1, Ca: 1, Cd: 1, Ce: 1, Cf: 1, Cl: 1, Cm: 1, Co: 1, Cr: 1, Cs: 1, Cu: 1, Db: 1, Dy: 1, Er: 1

Then, lookup atomic weights for each element in periodic table:
Ac: 227.0277521, Ag: 107.8682, Al: 26.9815386, Am: 241.0568291, Ar: 39.948, As: 74.9216, At: 209.987148, Au: 196.966569, B: 10.811, Ba: 137.327, Be: 9.012182, Bh: 272.13803, Bi: 208.9804, Bk: 247.070307, Br: 79.904, C: 12.0107, Ca: 40.078, Cd: 112.411, Ce: 140.116, Cf: 249.0748535, Cl: 35.453, Cm: 243.0613891, Co: 58.933195, Cr: 51.9961, Cs: 132.9054519, Cu: 63.546, Db: 268.12545, Dy: 162.5, Er: 167.259

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (AcAgAlAmArAsAtAuBBaBeBhBiBkBrCCaCdCeCfClCmCoCrCsCuDbDyEr) = ∑ Counti * Weighti =
Count(Ac) * Weight(Ac) + Count(Ag) * Weight(Ag) + Count(Al) * Weight(Al) + Count(Am) * Weight(Am) + Count(Ar) * Weight(Ar) + Count(As) * Weight(As) + Count(At) * Weight(At) + Count(Au) * Weight(Au) + Count(B) * Weight(B) + Count(Ba) * Weight(Ba) + Count(Be) * Weight(Be) + Count(Bh) * Weight(Bh) + Count(Bi) * Weight(Bi) + Count(Bk) * Weight(Bk) + Count(Br) * Weight(Br) + Count(C) * Weight(C) + Count(Ca) * Weight(Ca) + Count(Cd) * Weight(Cd) + Count(Ce) * Weight(Ce) + Count(Cf) * Weight(Cf) + Count(Cl) * Weight(Cl) + Count(Cm) * Weight(Cm) + Count(Co) * Weight(Co) + Count(Cr) * Weight(Cr) + Count(Cs) * Weight(Cs) + Count(Cu) * Weight(Cu) + Count(Db) * Weight(Db) + Count(Dy) * Weight(Dy) + Count(Er) * Weight(Er) =
1 * 227.0277521 + 1 * 107.8682 + 1 * 26.9815386 + 1 * 241.0568291 + 1 * 39.948 + 1 * 74.9216 + 1 * 209.987148 + 1 * 196.966569 + 1 * 10.811 + 1 * 137.327 + 1 * 9.012182 + 1 * 272.13803 + 1 * 208.9804 + 1 * 247.070307 + 1 * 79.904 + 1 * 12.0107 + 1 * 40.078 + 1 * 112.411 + 1 * 140.116 + 1 * 249.0748535 + 1 * 35.453 + 1 * 243.0613891 + 1 * 58.933195 + 1 * 51.9961 + 1 * 132.9054519 + 1 * 63.546 + 1 * 268.12545 + 1 * 162.5 + 1 * 167.259 =
3827.4707 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CAcAgAlAmArAsAtAuBBaBeBhBiBkBrCaCdCeCfClCmCoCrCsCuDbDyEr

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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