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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HeOAlAuFeHNNaP(C6H5)UTiSCuClCLiBrBeBFNeMgSiArLrLuNoYbHgPtAgPu is 2723.8558 g/mol

Convert between HeOAlAuFeHNNaP(C6H5)UTiSCuClCLiBrBeBFNeMgSiArLrLuNoYbHgPtAgPu weight and moles
CompoundMolesWeight, g
HeOAlAuFeHNNaP(C6H5)UTiSCuClCLiBrBeBFNeMgSiArLrLuNoYbHgPtAgPu

Elemental composition of HeOAlAuFeHNNaP(C6H5)UTiSCuClCLiBrBeBFNeMgSiArLrLuNoYbHgPtAgPu
ElementSymbolAtomic weightAtomsMass percent
HeliumHe4.00260210.1469
OxygenO15.999410.5874
AluminumAl26.981538610.9906
GoldAu196.96656917.2312
IronFe55.84512.0502
HydrogenH1.0079460.2220
NitrogenN14.006710.5142
SodiumNa22.9897692810.8440
PhosphorusP30.97376211.1371
UraniumU238.0289118.7387
TitaniumTi47.86711.7573
SulfurS32.06511.1772
CopperCu63.54612.3329
ChlorineCl35.45311.3016
CarbonC12.010773.0866
LithiumLi6.94110.2548
BromineBr79.90412.9335
BerylliumBe9.01218210.3309
BoronB10.81110.3969
FluorineF18.998403210.6975
NeonNe20.179710.7409
MagnesiumMg24.305010.8923
SiliconSi28.085511.0311
ArgonAr39.94811.4666
LawrenciumLr262.109619.6227
LutetiumLu174.966816.4235
NobeliumNo259.101019.5123
YtterbiumYb173.05416.3533
MercuryHg200.5917.3642
PlatinumPt195.08417.1621
SilverAg107.868213.9601
PlutoniumPu238.04956018.7394

Computing molar mass step by step

First, compute the number of each atom in HeOAlAuFeHNNaP(C6H5)UTiSCuClCLiBrBeBFNeMgSiArLrLuNoYbHgPtAgPu:
He: 1, O: 1, Al: 1, Au: 1, Fe: 1, H: 6, N: 1, Na: 1, P: 1, U: 1, Ti: 1, S: 1, Cu: 1, Cl: 1, C: 7, Li: 1, Br: 1, Be: 1, B: 1, F: 1, Ne: 1, Mg: 1, Si: 1, Ar: 1, Lr: 1, Lu: 1, No: 1, Yb: 1, Hg: 1, Pt: 1, Ag: 1, Pu: 1

Then, lookup atomic weights for each element in periodic table:
He: 4.002602, O: 15.9994, Al: 26.9815386, Au: 196.966569, Fe: 55.845, H: 1.00794, N: 14.0067, Na: 22.98976928, P: 30.973762, U: 238.02891, Ti: 47.867, S: 32.065, Cu: 63.546, Cl: 35.453, C: 12.0107, Li: 6.941, Br: 79.904, Be: 9.012182, B: 10.811, F: 18.9984032, Ne: 20.1797, Mg: 24.305, Si: 28.0855, Ar: 39.948, Lr: 262.10963, Lu: 174.9668, No: 259.10103, Yb: 173.054, Hg: 200.59, Pt: 195.084, Ag: 107.8682, Pu: 238.0495599

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HeOAlAuFeHNNaP(C6H5)UTiSCuClCLiBrBeBFNeMgSiArLrLuNoYbHgPtAgPu) = ∑ Counti * Weighti =
Count(He) * Weight(He) + Count(O) * Weight(O) + Count(Al) * Weight(Al) + Count(Au) * Weight(Au) + Count(Fe) * Weight(Fe) + Count(H) * Weight(H) + Count(N) * Weight(N) + Count(Na) * Weight(Na) + Count(P) * Weight(P) + Count(U) * Weight(U) + Count(Ti) * Weight(Ti) + Count(S) * Weight(S) + Count(Cu) * Weight(Cu) + Count(Cl) * Weight(Cl) + Count(C) * Weight(C) + Count(Li) * Weight(Li) + Count(Br) * Weight(Br) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Mg) * Weight(Mg) + Count(Si) * Weight(Si) + Count(Ar) * Weight(Ar) + Count(Lr) * Weight(Lr) + Count(Lu) * Weight(Lu) + Count(No) * Weight(No) + Count(Yb) * Weight(Yb) + Count(Hg) * Weight(Hg) + Count(Pt) * Weight(Pt) + Count(Ag) * Weight(Ag) + Count(Pu) * Weight(Pu) =
1 * 4.002602 + 1 * 15.9994 + 1 * 26.9815386 + 1 * 196.966569 + 1 * 55.845 + 6 * 1.00794 + 1 * 14.0067 + 1 * 22.98976928 + 1 * 30.973762 + 1 * 238.02891 + 1 * 47.867 + 1 * 32.065 + 1 * 63.546 + 1 * 35.453 + 7 * 12.0107 + 1 * 6.941 + 1 * 79.904 + 1 * 9.012182 + 1 * 10.811 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 24.305 + 1 * 28.0855 + 1 * 39.948 + 1 * 262.10963 + 1 * 174.9668 + 1 * 259.10103 + 1 * 173.054 + 1 * 200.59 + 1 * 195.084 + 1 * 107.8682 + 1 * 238.0495599 =
2723.8558 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C7H6AgAlArAuBBeBrClCuFFeHeHgLiLrLuMgNNaNeNoOPPtPuSSiTiUYb

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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