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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H2500HeAgMgCaKPSLrLuUutHgNNeAuCeFeZnBeBOClSiLiNaDInPt is 4653.7873 g/mol

Convert between H2500HeAgMgCaKPSLrLuUutHgNNeAuCeFeZnBeBOClSiLiNaDInPt weight and moles
CompoundMolesWeight, g
H2500HeAgMgCaKPSLrLuUutHgNNeAuCeFeZnBeBOClSiLiNaDInPt

Elemental composition of H2500HeAgMgCaKPSLrLuUutHgNNeAuCeFeZnBeBOClSiLiNaDInPt
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.00794250054.1462
HeliumHe4.00260210.0860
SilverAg107.868212.3179
MagnesiumMg24.305010.5223
CalciumCa40.07810.8612
PotassiumK39.098310.8401
PhosphorusP30.97376210.6656
SulfurS32.06510.6890
LawrenciumLr262.109615.6322
LutetiumLu174.966813.7597
NihoniumUut284.178116.1064
MercuryHg200.5914.3103
NitrogenN14.006710.3010
NeonNe20.179710.4336
GoldAu196.96656914.2324
CeriumCe140.11613.0108
IronFe55.84511.2000
ZincZn65.3811.4049
BerylliumBe9.01218210.1937
BoronB10.81110.2323
OxygenO15.999410.3438
ChlorineCl35.45310.7618
SiliconSi28.085510.6035
LithiumLi6.94110.1491
SodiumNa22.9897692810.4940
IndiumIn114.81812.4672
PlatinumPt195.08414.1919
HydrogenD2.014101777810.0433

Computing molar mass step by step

First, compute the number of each atom in H2500HeAgMgCaKPSLrLuUutHgNNeAuCeFeZnBeBOClSiLiNaDInPt:
H: 2500, He: 1, Ag: 1, Mg: 1, Ca: 1, K: 1, P: 1, S: 1, Lr: 1, Lu: 1, Uut: 1, Hg: 1, N: 1, Ne: 1, Au: 1, Ce: 1, Fe: 1, Zn: 1, Be: 1, B: 1, O: 1, Cl: 1, Si: 1, Li: 1, Na: 1, In: 1, Pt: 1, D: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Ag: 107.8682, Mg: 24.305, Ca: 40.078, K: 39.0983, P: 30.973762, S: 32.065, Lr: 262.10963, Lu: 174.9668, Uut: 284.17808, Hg: 200.59, N: 14.0067, Ne: 20.1797, Au: 196.966569, Ce: 140.116, Fe: 55.845, Zn: 65.38, Be: 9.012182, B: 10.811, O: 15.9994, Cl: 35.453, Si: 28.0855, Li: 6.941, Na: 22.98976928, In: 114.818, Pt: 195.084, D: 2.0141017778

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (H2500HeAgMgCaKPSLrLuUutHgNNeAuCeFeZnBeBOClSiLiNaDInPt) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Ag) * Weight(Ag) + Count(Mg) * Weight(Mg) + Count(Ca) * Weight(Ca) + Count(K) * Weight(K) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Lr) * Weight(Lr) + Count(Lu) * Weight(Lu) + Count(Uut) * Weight(Uut) + Count(Hg) * Weight(Hg) + Count(N) * Weight(N) + Count(Ne) * Weight(Ne) + Count(Au) * Weight(Au) + Count(Ce) * Weight(Ce) + Count(Fe) * Weight(Fe) + Count(Zn) * Weight(Zn) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(O) * Weight(O) + Count(Cl) * Weight(Cl) + Count(Si) * Weight(Si) + Count(Li) * Weight(Li) + Count(Na) * Weight(Na) + Count(In) * Weight(In) + Count(Pt) * Weight(Pt) + Count(D) * Weight(D) =
2500 * 1.00794 + 1 * 4.002602 + 1 * 107.8682 + 1 * 24.305 + 1 * 40.078 + 1 * 39.0983 + 1 * 30.973762 + 1 * 32.065 + 1 * 262.10963 + 1 * 174.9668 + 1 * 284.17808 + 1 * 200.59 + 1 * 14.0067 + 1 * 20.1797 + 1 * 196.966569 + 1 * 140.116 + 1 * 55.845 + 1 * 65.38 + 1 * 9.012182 + 1 * 10.811 + 1 * 15.9994 + 1 * 35.453 + 1 * 28.0855 + 1 * 6.941 + 1 * 22.98976928 + 1 * 114.818 + 1 * 195.084 + 1 * 2.0141017778 =
4653.7873 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgAuBBeCaCeClFeH2500DHeHgInKLiLrLuMgNNaNeOPPtSSiUutZn

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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