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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HeLiBeBCNOFNeNaMgAlHSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr is 1362.1922 g/mol

Convert between HeLiBeBCNOFNeNaMgAlHSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr weight and moles
CompoundMolesWeight, g
HeLiBeBCNOFNeNaMgAlHSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr

Elemental composition of HeLiBeBCNOFNeNaMgAlHSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr
ElementSymbolAtomic weightAtomsMass percent
HeliumHe4.00260210.2938
LithiumLi6.94110.5095
BerylliumBe9.01218210.6616
BoronB10.81110.7936
CarbonC12.010710.8817
NitrogenN14.006711.0282
OxygenO15.999411.1745
FluorineF18.998403211.3947
NeonNe20.179711.4814
SodiumNa22.9897692811.6877
MagnesiumMg24.305011.7843
AluminumAl26.981538611.9807
HydrogenH1.0079410.0740
SiliconSi28.085512.0618
PhosphorusP30.97376212.2738
SulfurS32.06512.3539
ChlorineCl35.45312.6026
ArgonAr39.94812.9326
PotassiumK39.098312.8702
CalciumCa40.07812.9422
ScandiumSc44.95591213.3003
TitaniumTi47.86713.5140
VanadiumV50.941513.7397
ChromiumCr51.996113.8171
ManganeseMn54.93804514.0331
IronFe55.84514.0996
CobaltCo58.93319514.3263
NickelNi58.693414.3087
CopperCu63.54614.6650
ZincZn65.3814.7996
GalliumGa69.72315.1184
GermaniumGe72.6415.3326
ArsenicAs74.9216015.5001
SeleniumSe78.9615.7965
BromineBr79.90415.8658

Computing molar mass step by step

First, compute the number of each atom in HeLiBeBCNOFNeNaMgAlHSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr:
He: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Na: 1, Mg: 1, Al: 1, H: 1, Si: 1, P: 1, S: 1, Cl: 1, Ar: 1, K: 1, Ca: 1, Sc: 1, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1, Ni: 1, Cu: 1, Zn: 1, Ga: 1, Ge: 1, As: 1, Se: 1, Br: 1

Then, lookup atomic weights for each element in periodic table:
He: 4.002602, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, H: 1.00794, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Cr: 51.9961, Mn: 54.938045, Fe: 55.845, Co: 58.933195, Ni: 58.6934, Cu: 63.546, Zn: 65.38, Ga: 69.723, Ge: 72.64, As: 74.9216, Se: 78.96, Br: 79.904

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HeLiBeBCNOFNeNaMgAlHSiPSClArKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBr) = ∑ Counti * Weighti =
Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(H) * Weight(H) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + 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(Co) * Weight(Co) + Count(Ni) * Weight(Ni) + Count(Cu) * Weight(Cu) + Count(Zn) * Weight(Zn) + Count(Ga) * Weight(Ga) + Count(Ge) * Weight(Ge) + Count(As) * Weight(As) + Count(Se) * Weight(Se) + Count(Br) * Weight(Br) =
1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 1.00794 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 1 * 39.948 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 50.9415 + 1 * 51.9961 + 1 * 54.938045 + 1 * 55.845 + 1 * 58.933195 + 1 * 58.6934 + 1 * 63.546 + 1 * 65.38 + 1 * 69.723 + 1 * 72.64 + 1 * 74.9216 + 1 * 78.96 + 1 * 79.904 =
1362.1922 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeBrCaClCoCrCuFFeGaGeHeKLiMgMnNNaNeNiOPSScSeSiTiVZn

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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