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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H81He9Li9Be9BCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAs is 1392.6682 g/mol

Convert between H81He9Li9Be9BCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAs weight and moles
CompoundMolesWeight, g
H81He9Li9Be9BCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAs

Elemental composition of H81He9Li9Be9BCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAs
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.00794815.8624
HeliumHe4.00260292.5866
LithiumLi6.94194.4856
BerylliumBe9.01218295.8240
BoronB10.81110.7763
CarbonC12.010710.8624
NitrogenN14.006711.0057
OxygenO15.999411.1488
FluorineF18.998403211.3642
NeonNe20.179711.4490
SodiumNa22.9897692811.6508
MagnesiumMg24.305011.7452
AluminumAl26.981538611.9374
SiliconSi28.085512.0167
PhosphorusP30.97376212.2241
SulfurS32.06512.3024
ChlorineCl35.45312.5457
ArgonAr39.94812.8685
PotassiumK39.098312.8074
CalciumCa40.07812.8778
ScandiumSc44.95591213.2280
TitaniumTi47.86713.4371
ChromiumCr51.996113.7336
ManganeseMn54.93804513.9448
IronFe55.84514.0099
CobaltCo58.93319514.2317
NickelNi58.693414.2145
CopperCu63.54614.5629
ZincZn65.3814.6946
GalliumGa69.72315.0064
GermaniumGe72.6415.2159
ArsenicAs74.9216015.3797

Computing molar mass step by step

First, compute the number of each atom in H81He9Li9Be9BCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAs:
H: 81, He: 9, Li: 9, Be: 9, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Na: 1, Mg: 1, Al: 1, Si: 1, P: 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

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, O: 15.9994, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, 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, 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

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (H81He9Li9Be9BCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAs) = ∑ 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(O) * Weight(O) + 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(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(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) =
81 * 1.00794 + 9 * 4.002602 + 9 * 6.941 + 9 * 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 * 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 * 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 =
1392.6682 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CH81AlArAsBBe9CaClCoCrCuFFeGaGeHe9KLi9MgMnNNaNeNiOPSScSiTiZn

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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