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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of (H457HeLiBeBCN33O29FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu)999 is 2274205.4072 g/mol

Convert between (H457HeLiBeBCN33O29FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu)999 weight and moles
CompoundMolesWeight, g
(H457HeLiBeBCN33O29FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu)999

Elemental composition of (H457HeLiBeBCN33O29FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu)999
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079445654320.2342
HeliumHe4.0026029990.1758
LithiumLi6.9419990.3049
BerylliumBe9.0121829990.3959
BoronB10.8119990.4749
CarbonC12.01079990.5276
NitrogenN14.00673296720.3042
OxygenO15.99942897120.3816
FluorineF18.99840329990.8346
NeonNe20.17979990.8864
SodiumNa22.989769289991.0099
MagnesiumMg24.30509991.0677
AluminumAl26.98153869991.1852
SiliconSi28.08559991.2337
PhosphorusP30.9737629991.3606
SulfurS32.0659991.4085
ChlorineCl35.4539991.5574
ArgonAr39.9489991.7548
PotassiumK39.09839991.7175
CalciumCa40.0789991.7605
ScandiumSc44.9559129991.9748
TitaniumTi47.8679992.1027
VanadiumV50.94159992.2377
ChromiumCr51.99619992.2841
ManganeseMn54.9380459992.4133
IronFe55.8459992.4531
CobaltCo58.9331959992.5888
NickelNi58.69349992.5783
CopperCu63.5469992.7914

Computing molar mass step by step

First, compute the number of each atom in (H457HeLiBeBCN33O29FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu)999:
H: 456543, He: 999, Li: 999, Be: 999, B: 999, C: 999, N: 32967, O: 28971, F: 999, Ne: 999, Na: 999, Mg: 999, Al: 999, Si: 999, P: 999, S: 999, Cl: 999, Ar: 999, K: 999, Ca: 999, Sc: 999, Ti: 999, V: 999, Cr: 999, Mn: 999, Fe: 999, Co: 999, Ni: 999, Cu: 999

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, V: 50.9415, Cr: 51.9961, Mn: 54.938045, Fe: 55.845, Co: 58.933195, Ni: 58.6934, Cu: 63.546

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass ((H457HeLiBeBCN33O29FNeNaMgAlSiPSClArKCaScTiVCrMnFeCoNiCu)999) = ∑ 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(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) =
456543 * 1.00794 + 999 * 4.002602 + 999 * 6.941 + 999 * 9.012182 + 999 * 10.811 + 999 * 12.0107 + 32967 * 14.0067 + 28971 * 15.9994 + 999 * 18.9984032 + 999 * 20.1797 + 999 * 22.98976928 + 999 * 24.305 + 999 * 26.9815386 + 999 * 28.0855 + 999 * 30.973762 + 999 * 32.065 + 999 * 35.453 + 999 * 39.948 + 999 * 39.0983 + 999 * 40.078 + 999 * 44.955912 + 999 * 47.867 + 999 * 50.9415 + 999 * 51.9961 + 999 * 54.938045 + 999 * 55.845 + 999 * 58.933195 + 999 * 58.6934 + 999 * 63.546 =
2274205.4072 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C999H456543Al999Ar999B999Be999Ca999Cl999Co999Cr999Cu999F999Fe999He999K999Li999Mg999Mn999N32967Na999Ne999Ni999O28971P999S999Sc999Si999Ti999V999

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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