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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCoZnGa is 1899.9431 g/mol

Convert between AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCoZnGa weight and moles
CompoundMolesWeight, g
AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCoZnGa

Elemental composition of AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCoZnGa
ElementSymbolAtomic weightAtomsMass percent
AluminumAl26.981538611.4201
SiliconSi28.085511.4782
BoronB10.81110.5690
CopperCu63.54613.3446
NickelNi58.693413.0892
HydrogenH1.0079410.0531
HeliumHe4.00260210.2107
MolybdenumMo95.9615.0507
UraniumU238.02891112.5282
PlutoniumPu238.049560112.5293
BohriumBh272.1380114.3235
LithiumLi6.94110.3653
BerylliumBe9.01218210.4743
CarbonC12.010710.6322
NitrogenN14.006710.7372
OxygenO15.999410.8421
PhosphorusP30.97376211.6302
SulfurS32.06511.6877
FluorineF18.998403210.9999
NeonNe20.179711.0621
ChlorineCl35.45311.8660
ArgonAr39.94812.1026
SodiumNa22.9897692811.2100
MagnesiumMg24.305011.2792
PotassiumK39.098312.0579
CalciumCa40.07812.1094
ScandiumSc44.95591212.3662
TitaniumTi47.86712.5194
VanadiumV50.941512.6812
ChromiumCr51.996112.7367
ManganeseMn54.93804512.8916
IronFe55.84512.9393
CobaltCo58.93319513.1018
ZincZn65.3813.4412
GalliumGa69.72313.6697

Computing molar mass step by step

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

Then, lookup atomic weights for each element in periodic table:
Al: 26.9815386, Si: 28.0855, B: 10.811, Cu: 63.546, Ni: 58.6934, H: 1.00794, He: 4.002602, Mo: 95.96, U: 238.02891, Pu: 238.0495599, Bh: 272.13803, Li: 6.941, Be: 9.012182, C: 12.0107, N: 14.0067, O: 15.9994, P: 30.973762, S: 32.065, F: 18.9984032, Ne: 20.1797, Cl: 35.453, Ar: 39.948, Na: 22.98976928, Mg: 24.305, 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, Zn: 65.38, Ga: 69.723

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCoZnGa) = ∑ Counti * Weighti =
Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(B) * Weight(B) + Count(Cu) * Weight(Cu) + Count(Ni) * Weight(Ni) + Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Mo) * Weight(Mo) + Count(U) * Weight(U) + Count(Pu) * Weight(Pu) + Count(Bh) * Weight(Bh) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + 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(Zn) * Weight(Zn) + Count(Ga) * Weight(Ga) =
1 * 26.9815386 + 1 * 28.0855 + 1 * 10.811 + 1 * 63.546 + 1 * 58.6934 + 1 * 1.00794 + 1 * 4.002602 + 1 * 95.96 + 1 * 238.02891 + 1 * 238.0495599 + 1 * 272.13803 + 1 * 6.941 + 1 * 9.012182 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 30.973762 + 1 * 32.065 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 35.453 + 1 * 39.948 + 1 * 22.98976928 + 1 * 24.305 + 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 * 65.38 + 1 * 69.723 =
1899.9431 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArBBeBhCaClCoCrCuFFeGaHeKLiMgMnMoNNaNeNiOPPuSScSiTiUVZn

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, 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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