Printed from https://www.webqc.org

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrK is 1350.3490 g/mol

Convert between HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrK weight and moles
CompoundMolesWeight, g
HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrK

Elemental composition of HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrK
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0746
HeliumHe4.00260210.2964
LithiumLi6.94110.5140
BerylliumBe9.01218210.6674
BoronB10.81110.8006
CarbonC12.010710.8895
NitrogenN14.006711.0373
OxygenO15.999411.1848
FluorineF18.998403211.4069
NeonNe20.179711.4944
SodiumNa22.9897692811.7025
MagnesiumMg24.305011.7999
AluminumAl26.981538611.9981
SiliconSi28.085512.0799
PhosphorusP30.97376212.2938
SulfurS32.06512.3746
ChlorineCl35.45312.6255
ArgonAr39.94812.9583
PotassiumK39.098325.7908
CalciumCa40.07812.9680
ScandiumSc44.95591213.3292
TitaniumTi47.86713.5448
ChromiumCr51.996113.8506
ManganeseMn54.93804514.0684
IronFe55.84514.1356
CobaltCo58.93319514.3643
NickelNi58.693414.3465
CopperCu63.54614.7059
ZincZn65.3814.8417
GalliumGa69.72315.1633
GermaniumGe72.6415.3793
ArsenicAs74.9216015.5483
SeleniumSe78.9615.8474
BromineBr79.90415.9173

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrK:
H: 1, He: 1, Li: 1, Be: 1, 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: 2, 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

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, Se: 78.96, Br: 79.904

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCNOFNeNaMgAlSiPSClArKCaScTiCrMnFeCoNiCuZnGaGeAsSeBrK) = ∑ 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) + Count(Se) * Weight(Se) + Count(Br) * Weight(Br) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 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 + 2 * 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 =
1350.3490 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeBrCaClCoCrCuFFeGaGeHeK2LiMgMnNNaNeNiOPSScSeSiTiZn

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
Please let us know how we can improve this web app.
Menu Balance Molar mass Gas laws Units Chemistry tools Periodic table Chemical forum Symmetry Constants Contribute Contact us
How to cite?
Choose languageDeutschEnglishEspañolFrançaisItalianoNederlandsPolskiPortuguêsРусский中文日本語한국어