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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeBCN5O5F5NaMgAlSiPS5Cl5KCaBaZnFeSnPbCuHgAgPtAu11MnWBr4I4 is 5219.1016 g/mol

Convert between HLiBeBCN5O5F5NaMgAlSiPS5Cl5KCaBaZnFeSnPbCuHgAgPtAu11MnWBr4I4 weight and moles
CompoundMolesWeight, g
HLiBeBCN5O5F5NaMgAlSiPS5Cl5KCaBaZnFeSnPbCuHgAgPtAu11MnWBr4I4

Elemental composition of HLiBeBCN5O5F5NaMgAlSiPS5Cl5KCaBaZnFeSnPbCuHgAgPtAu11MnWBr4I4
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0193
LithiumLi6.94110.1330
BerylliumBe9.01218210.1727
BoronB10.81110.2071
CarbonC12.010710.2301
NitrogenN14.006751.3419
OxygenO15.999451.5328
FluorineF18.998403251.8201
SodiumNa22.9897692810.4405
MagnesiumMg24.305010.4657
AluminumAl26.981538610.5170
SiliconSi28.085510.5381
PhosphorusP30.97376210.5935
SulfurS32.06553.0719
ChlorineCl35.45353.3965
PotassiumK39.098310.7491
CalciumCa40.07810.7679
BariumBa137.32712.6312
ZincZn65.3811.2527
IronFe55.84511.0700
TinSn118.71012.2745
LeadPb207.213.9700
CopperCu63.54611.2176
MercuryHg200.5913.8434
SilverAg107.868212.0668
PlatinumPt195.08413.7379
GoldAu196.9665691141.5135
ManganeseMn54.93804511.0526
TungstenW183.8413.5224
BromineBr79.90446.1240
IodineI126.9044749.7262

Computing molar mass step by step

First, compute the number of each atom in HLiBeBCN5O5F5NaMgAlSiPS5Cl5KCaBaZnFeSnPbCuHgAgPtAu11MnWBr4I4:
H: 1, Li: 1, Be: 1, B: 1, C: 1, N: 5, O: 5, F: 5, Na: 1, Mg: 1, Al: 1, Si: 1, P: 1, S: 5, Cl: 5, K: 1, Ca: 1, Ba: 1, Zn: 1, Fe: 1, Sn: 1, Pb: 1, Cu: 1, Hg: 1, Ag: 1, Pt: 1, Au: 11, Mn: 1, W: 1, Br: 4, I: 4

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, K: 39.0983, Ca: 40.078, Ba: 137.327, Zn: 65.38, Fe: 55.845, Sn: 118.71, Pb: 207.2, Cu: 63.546, Hg: 200.59, Ag: 107.8682, Pt: 195.084, Au: 196.966569, Mn: 54.938045, W: 183.84, Br: 79.904, I: 126.90447

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HLiBeBCN5O5F5NaMgAlSiPS5Cl5KCaBaZnFeSnPbCuHgAgPtAu11MnWBr4I4) = ∑ Counti * Weighti =
Count(H) * Weight(H) + 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(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(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Ba) * Weight(Ba) + Count(Zn) * Weight(Zn) + Count(Fe) * Weight(Fe) + Count(Sn) * Weight(Sn) + Count(Pb) * Weight(Pb) + Count(Cu) * Weight(Cu) + Count(Hg) * Weight(Hg) + Count(Ag) * Weight(Ag) + Count(Pt) * Weight(Pt) + Count(Au) * Weight(Au) + Count(Mn) * Weight(Mn) + Count(W) * Weight(W) + Count(Br) * Weight(Br) + Count(I) * Weight(I) =
1 * 1.00794 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 5 * 14.0067 + 5 * 15.9994 + 5 * 18.9984032 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 5 * 32.065 + 5 * 35.453 + 1 * 39.0983 + 1 * 40.078 + 1 * 137.327 + 1 * 65.38 + 1 * 55.845 + 1 * 118.71 + 1 * 207.2 + 1 * 63.546 + 1 * 200.59 + 1 * 107.8682 + 1 * 195.084 + 11 * 196.966569 + 1 * 54.938045 + 1 * 183.84 + 4 * 79.904 + 4 * 126.90447 =
5219.1016 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAlAu11BBaBeBr4CaCl5CuF5FeHgI4KLiMgMnN5NaO5PPbPtS5SiSnWZn

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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