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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnCn is 1207.0875 g/mol

Convert between HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnCn weight and moles
CompoundMolesWeight, g
HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnCn

Elemental composition of HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnCn
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0835
LithiumLi6.94110.5750
BerylliumBe9.01218210.7466
BoronB10.81110.8956
CarbonC12.010710.9950
NitrogenN14.006711.1604
OxygenO15.999411.3255
FluorineF18.998403211.5739
SodiumNa22.9897692811.9046
MagnesiumMg24.305012.0135
AluminumAl26.981538612.2353
SiliconSi28.085512.3267
PhosphorusP30.97376212.5660
SulfurS32.06512.6564
ChlorineCl35.45312.9371
PotassiumK39.098313.2391
CalciumCa40.07813.3202
ScandiumSc44.95591213.7243
TitaniumTi47.86713.9655
VanadiumV50.941514.2202
ChromiumCr51.996114.3076
ManganeseMn54.93804514.5513
IronFe55.84514.6264
CobaltCo58.93319514.8823
NickelNi58.693414.8624
CopperCu63.54615.2644
ZincZn65.3815.4163
CoperniciumCn285.1741123.6250

Computing molar mass step by step

First, compute the number of each atom in HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnCn:
H: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Na: 1, Mg: 1, Al: 1, Si: 1, P: 1, S: 1, Cl: 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, Cn: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, 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, Cn: 285.17411

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnCn) = ∑ Counti * Weighti =
Count(H) * Weight(H) + 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(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + 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(Cn) * Weight(Cn) =
1 * 1.00794 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 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 * 285.17411 =
1207.0875 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlBBeCaClCnCoCrCuFFeKLiMgMnNNaNiOPSScSiTiVZn

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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