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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of BaBeAuAgArRnTiUWHOCCaClCrBBrMtMgYIInAlSeAsGeGaNaNNeFeScNiFP is 2640.0619 g/mol

Convert between BaBeAuAgArRnTiUWHOCCaClCrBBrMtMgYIInAlSeAsGeGaNaNNeFeScNiFP weight and moles
CompoundMolesWeight, g
BaBeAuAgArRnTiUWHOCCaClCrBBrMtMgYIInAlSeAsGeGaNaNNeFeScNiFP

Elemental composition of BaBeAuAgArRnTiUWHOCCaClCrBBrMtMgYIInAlSeAsGeGaNaNNeFeScNiFP
ElementSymbolAtomic weightAtomsMass percent
BariumBa137.32715.2017
BerylliumBe9.01218210.3414
GoldAu196.96656917.4607
SilverAg107.868214.0858
ArgonAr39.94811.5131
RadonRn210.99060117.9919
TitaniumTi47.86711.8131
UraniumU238.0289119.0160
TungstenW183.8416.9635
HydrogenH1.0079410.0382
OxygenO15.999410.6060
CarbonC12.010710.4549
CalciumCa40.07811.5181
ChlorineCl35.45311.3429
ChromiumCr51.996111.9695
BoronB10.81110.4095
BromineBr79.90413.0266
MeitneriumMt276.1512110.4600
MagnesiumMg24.305010.9206
YttriumY88.9058513.3676
IodineI126.9044714.8069
IndiumIn114.81814.3491
AluminumAl26.981538611.0220
SeleniumSe78.9612.9908
ArsenicAs74.9216012.8379
GermaniumGe72.6412.7515
GalliumGa69.72312.6410
SodiumNa22.9897692810.8708
NitrogenN14.006710.5305
NeonNe20.179710.7644
IronFe55.84512.1153
ScandiumSc44.95591211.7028
NickelNi58.693412.2232
FluorineF18.998403210.7196
PhosphorusP30.97376211.1732

Computing molar mass step by step

First, compute the number of each atom in BaBeAuAgArRnTiUWHOCCaClCrBBrMtMgYIInAlSeAsGeGaNaNNeFeScNiFP:
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, Mt: 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, Mt: 276.15116, 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 (BaBeAuAgArRnTiUWHOCCaClCrBBrMtMgYIInAlSeAsGeGaNaNNeFeScNiFP) = ∑ 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(Mt) * Weight(Mt) + 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 * 276.15116 + 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 =
2640.0619 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAlArAsAuBBaBeBrCaClCrFFeGaGeIInMgMtNNaNeNiOPRnScSeTiUWY

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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