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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of BaBeAuAgArRnTiUWHOCCaClCrBBrMnMgYIInAlSeAsGeGaNaNNeFeScNiFP is 2418.8488 g/mol

Convert between BaBeAuAgArRnTiUWHOCCaClCrBBrMnMgYIInAlSeAsGeGaNaNNeFeScNiFP weight and moles
CompoundMolesWeight, g
BaBeAuAgArRnTiUWHOCCaClCrBBrMnMgYIInAlSeAsGeGaNaNNeFeScNiFP

Elemental composition of BaBeAuAgArRnTiUWHOCCaClCrBBrMnMgYIInAlSeAsGeGaNaNNeFeScNiFP
ElementSymbolAtomic weightAtomsMass percent
BariumBa137.32715.6774
BerylliumBe9.01218210.3726
GoldAu196.96656918.1430
SilverAg107.868214.4595
ArgonAr39.94811.6515
RadonRn210.99060118.7228
TitaniumTi47.86711.9789
UraniumU238.0289119.8406
TungstenW183.8417.6003
HydrogenH1.0079410.0417
OxygenO15.999410.6614
CarbonC12.010710.4965
CalciumCa40.07811.6569
ChlorineCl35.45311.4657
ChromiumCr51.996112.1496
BoronB10.81110.4469
BromineBr79.90413.3034
ManganeseMn54.93804512.2712
MagnesiumMg24.305011.0048
YttriumY88.9058513.6755
IodineI126.9044715.2465
IndiumIn114.81814.7468
AluminumAl26.981538611.1155
SeleniumSe78.9613.2644
ArsenicAs74.9216013.0974
GermaniumGe72.6413.0031
GalliumGa69.72312.8825
SodiumNa22.9897692810.9504
NitrogenN14.006710.5791
NeonNe20.179710.8343
IronFe55.84512.3087
ScandiumSc44.95591211.8586
NickelNi58.693412.4265
FluorineF18.998403210.7854
PhosphorusP30.97376211.2805

Computing molar mass step by step

First, compute the number of each atom in BaBeAuAgArRnTiUWHOCCaClCrBBrMnMgYIInAlSeAsGeGaNaNNeFeScNiFP:
Ba: 1, Be: 1, Au: 1, Ag: 1, Ar: 1, Rn: 1, Ti: 1, U: 1, W: 1, H: 1, O: 1, C: 1, Ca: 1, Cl: 1, Cr: 1, B: 1, Br: 1, Mn: 1, Mg: 1, Y: 1, I: 1, In: 1, Al: 1, Se: 1, As: 1, Ge: 1, Ga: 1, Na: 1, N: 1, Ne: 1, Fe: 1, Sc: 1, Ni: 1, F: 1, P: 1

Then, lookup atomic weights for each element in periodic table:
Ba: 137.327, Be: 9.012182, Au: 196.966569, Ag: 107.8682, Ar: 39.948, Rn: 210.990601, Ti: 47.867, U: 238.02891, W: 183.84, H: 1.00794, O: 15.9994, C: 12.0107, Ca: 40.078, Cl: 35.453, Cr: 51.9961, B: 10.811, Br: 79.904, Mn: 54.938045, Mg: 24.305, Y: 88.90585, I: 126.90447, In: 114.818, Al: 26.9815386, Se: 78.96, As: 74.9216, Ge: 72.64, Ga: 69.723, Na: 22.98976928, N: 14.0067, Ne: 20.1797, Fe: 55.845, Sc: 44.955912, Ni: 58.6934, F: 18.9984032, P: 30.973762

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (BaBeAuAgArRnTiUWHOCCaClCrBBrMnMgYIInAlSeAsGeGaNaNNeFeScNiFP) = ∑ Counti * Weighti =
Count(Ba) * Weight(Ba) + Count(Be) * Weight(Be) + Count(Au) * Weight(Au) + Count(Ag) * Weight(Ag) + Count(Ar) * Weight(Ar) + Count(Rn) * Weight(Rn) + Count(Ti) * Weight(Ti) + Count(U) * Weight(U) + Count(W) * Weight(W) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(C) * Weight(C) + Count(Ca) * Weight(Ca) + Count(Cl) * Weight(Cl) + Count(Cr) * Weight(Cr) + Count(B) * Weight(B) + Count(Br) * Weight(Br) + Count(Mn) * Weight(Mn) + Count(Mg) * Weight(Mg) + Count(Y) * Weight(Y) + Count(I) * Weight(I) + Count(In) * Weight(In) + Count(Al) * Weight(Al) + Count(Se) * Weight(Se) + Count(As) * Weight(As) + Count(Ge) * Weight(Ge) + Count(Ga) * Weight(Ga) + Count(Na) * Weight(Na) + Count(N) * Weight(N) + Count(Ne) * Weight(Ne) + Count(Fe) * Weight(Fe) + Count(Sc) * Weight(Sc) + Count(Ni) * Weight(Ni) + Count(F) * Weight(F) + Count(P) * Weight(P) =
1 * 137.327 + 1 * 9.012182 + 1 * 196.966569 + 1 * 107.8682 + 1 * 39.948 + 1 * 210.990601 + 1 * 47.867 + 1 * 238.02891 + 1 * 183.84 + 1 * 1.00794 + 1 * 15.9994 + 1 * 12.0107 + 1 * 40.078 + 1 * 35.453 + 1 * 51.9961 + 1 * 10.811 + 1 * 79.904 + 1 * 54.938045 + 1 * 24.305 + 1 * 88.90585 + 1 * 126.90447 + 1 * 114.818 + 1 * 26.9815386 + 1 * 78.96 + 1 * 74.9216 + 1 * 72.64 + 1 * 69.723 + 1 * 22.98976928 + 1 * 14.0067 + 1 * 20.1797 + 1 * 55.845 + 1 * 44.955912 + 1 * 58.6934 + 1 * 18.9984032 + 1 * 30.973762 =
2418.8488 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAlArAsAuBBaBeBrCaClCrFFeGaGeIInMgMnNNaNeNiOPRnScSeTiUWY

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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