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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of (HHeLiBeBCNOFNeMgSiPSClKCaScTiVCrMnFeCoNiCuZnGeInSnOgLaAcU)9 is 16256.2903 g/mol

Convert between (HHeLiBeBCNOFNeMgSiPSClKCaScTiVCrMnFeCoNiCuZnGeInSnOgLaAcU)9 weight and moles
CompoundMolesWeight, g
(HHeLiBeBCNOFNeMgSiPSClKCaScTiVCrMnFeCoNiCuZnGeInSnOgLaAcU)9

Elemental composition of (HHeLiBeBCNOFNeMgSiPSClKCaScTiVCrMnFeCoNiCuZnGeInSnOgLaAcU)9
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079490.0558
HeliumHe4.00260290.2216
LithiumLi6.94190.3843
BerylliumBe9.01218290.4989
BoronB10.81190.5985
CarbonC12.010790.6650
NitrogenN14.006790.7755
OxygenO15.999490.8858
FluorineF18.998403291.0518
NeonNe20.179791.1172
MagnesiumMg24.305091.3456
SiliconSi28.085591.5549
PhosphorusP30.97376291.7148
SulfurS32.06591.7752
ChlorineCl35.45391.9628
PotassiumK39.098392.1646
CalciumCa40.07892.2188
ScandiumSc44.95591292.4889
TitaniumTi47.86792.6501
VanadiumV50.941592.8203
ChromiumCr51.996192.8787
ManganeseMn54.93804593.0415
IronFe55.84593.0918
CobaltCo58.93319593.2627
NickelNi58.693493.2495
CopperCu63.54693.5181
ZincZn65.3893.6196
GermaniumGe72.6494.0216
IndiumIn114.81896.3567
TinSn118.71096.5722
OganessonOg0.000000090.0000
LanthanumLa138.9054797.6902
ActiniumAc227.027752912.5690
UraniumU238.02891913.1780

Computing molar mass step by step

First, compute the number of each atom in (HHeLiBeBCNOFNeMgSiPSClKCaScTiVCrMnFeCoNiCuZnGeInSnOgLaAcU)9:
H: 9, He: 9, Li: 9, Be: 9, B: 9, C: 9, N: 9, O: 9, F: 9, Ne: 9, Mg: 9, Si: 9, P: 9, S: 9, Cl: 9, K: 9, Ca: 9, Sc: 9, Ti: 9, V: 9, Cr: 9, Mn: 9, Fe: 9, Co: 9, Ni: 9, Cu: 9, Zn: 9, Ge: 9, In: 9, Sn: 9, Og: 9, La: 9, Ac: 9, U: 9

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, Mg: 24.305, 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, Ge: 72.64, In: 114.818, Sn: 118.71, Og: 0, La: 138.90547, Ac: 227.0277521, U: 238.02891

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass ((HHeLiBeBCNOFNeMgSiPSClKCaScTiVCrMnFeCoNiCuZnGeInSnOgLaAcU)9) = ∑ 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(Mg) * Weight(Mg) + 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(Ge) * Weight(Ge) + Count(In) * Weight(In) + Count(Sn) * Weight(Sn) + Count(Og) * Weight(Og) + Count(La) * Weight(La) + Count(Ac) * Weight(Ac) + Count(U) * Weight(U) =
9 * 1.00794 + 9 * 4.002602 + 9 * 6.941 + 9 * 9.012182 + 9 * 10.811 + 9 * 12.0107 + 9 * 14.0067 + 9 * 15.9994 + 9 * 18.9984032 + 9 * 20.1797 + 9 * 24.305 + 9 * 28.0855 + 9 * 30.973762 + 9 * 32.065 + 9 * 35.453 + 9 * 39.0983 + 9 * 40.078 + 9 * 44.955912 + 9 * 47.867 + 9 * 50.9415 + 9 * 51.9961 + 9 * 54.938045 + 9 * 55.845 + 9 * 58.933195 + 9 * 58.6934 + 9 * 63.546 + 9 * 65.38 + 9 * 72.64 + 9 * 114.818 + 9 * 118.71 + 9 * 0 + 9 * 138.90547 + 9 * 227.0277521 + 9 * 238.02891 =
16256.2903 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C9H9Ac9B9Be9Ca9Cl9Co9Cr9Cu9F9Fe9Ge9He9In9K9La9Li9Mg9Mn9N9Ne9Ni9O9Og9P9S9Sc9Si9Sn9Ti9U9V9Zn9

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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