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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCNPFNeNaMgAlSiSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrLr is 1557.3610 g/mol

Convert between HHeLiBeBCNPFNeNaMgAlSiSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrLr weight and moles
CompoundMolesWeight, g
HHeLiBeBCNPFNeNaMgAlSiSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrLr

Elemental composition of HHeLiBeBCNPFNeNaMgAlSiSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrLr
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0647
HeliumHe4.00260210.2570
LithiumLi6.94110.4457
BerylliumBe9.01218210.5787
BoronB10.81110.6942
CarbonC12.010710.7712
NitrogenN14.006710.8994
PhosphorusP30.97376211.9889
FluorineF18.998403211.2199
NeonNe20.179711.2958
SodiumNa22.9897692811.4762
MagnesiumMg24.305011.5607
AluminumAl26.981538611.7325
SiliconSi28.085511.8034
SulfurS32.06512.0589
ChlorineCl35.45312.2765
ArgonAr39.94812.5651
PotassiumK39.098312.5105
CalciumCa40.07812.5735
ScandiumSc44.95591212.8867
TitaniumTi47.86713.0736
ChromiumCr51.996113.3387
ManganeseMn54.93804513.5276
IronFe55.84513.5859
CobaltCo58.93319513.7842
NickelNi58.693413.7688
CopperCu63.54614.0804
ZincZn65.3814.1981
GalliumGa69.72314.4770
GermaniumGe72.6414.6643
ArsenicAs74.9216014.8108
SeleniumSe78.9615.0701
BromineBr79.90415.1307
LawrenciumLr262.1096116.8304

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCNPFNeNaMgAlSiSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrLr:
H: 1, He: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, P: 1, F: 1, Ne: 1, Na: 1, Mg: 1, Al: 1, Si: 1, S: 1, Cl: 1, Ar: 1, K: 1, Ca: 1, Sc: 1, Ti: 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, Lr: 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, C: 12.0107, N: 14.0067, P: 30.973762, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, 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, Lr: 262.10963

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCNPFNeNaMgAlSiSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrLr) = ∑ Counti * Weighti =
Count(H) * Weight(H) + 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(P) * Weight(P) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + 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(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) + Count(Lr) * Weight(Lr) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 30.973762 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 32.065 + 1 * 35.453 + 1 * 39.948 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 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 + 1 * 262.10963 =
1557.3610 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeBrCaClCoCrCuFFeGaGeHeKLiLrMgMnNNaNeNiPSScSeSiTiZn

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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