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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HOClAuAgHgPbAuArNeHeCeBrCuFeKPOVICZnIr is 1899.1181 g/mol

Convert between HOClAuAgHgPbAuArNeHeCeBrCuFeKPOVICZnIr weight and moles
CompoundMolesWeight, g
HOClAuAgHgPbAuArNeHeCeBrCuFeKPOVICZnIr

Elemental composition of HOClAuAgHgPbAuArNeHeCeBrCuFeKPOVICZnIr
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0531
OxygenO15.999421.6849
ChlorineCl35.45311.8668
GoldAu196.966569220.7430
SilverAg107.868215.6799
MercuryHg200.59110.5623
LeadPb207.2110.9103
ArgonAr39.94812.1035
NeonNe20.179711.0626
HeliumHe4.00260210.2108
CeriumCe140.11617.3780
BromineBr79.90414.2074
CopperCu63.54613.3461
IronFe55.84512.9406
PotassiumK39.098312.0588
PhosphorusP30.97376211.6310
VanadiumV50.941512.6824
IodineI126.9044716.6823
CarbonC12.010710.6324
ZincZn65.3813.4427
IridiumIr192.217110.1214

Computing molar mass step by step

First, compute the number of each atom in HOClAuAgHgPbAuArNeHeCeBrCuFeKPOVICZnIr:
H: 1, O: 2, Cl: 1, Au: 2, Ag: 1, Hg: 1, Pb: 1, Ar: 1, Ne: 1, He: 1, Ce: 1, Br: 1, Cu: 1, Fe: 1, K: 1, P: 1, V: 1, I: 1, C: 1, Zn: 1, Ir: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, O: 15.9994, Cl: 35.453, Au: 196.966569, Ag: 107.8682, Hg: 200.59, Pb: 207.2, Ar: 39.948, Ne: 20.1797, He: 4.002602, Ce: 140.116, Br: 79.904, Cu: 63.546, Fe: 55.845, K: 39.0983, P: 30.973762, V: 50.9415, I: 126.90447, C: 12.0107, Zn: 65.38, Ir: 192.217

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HOClAuAgHgPbAuArNeHeCeBrCuFeKPOVICZnIr) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(O) * Weight(O) + Count(Cl) * Weight(Cl) + Count(Au) * Weight(Au) + Count(Ag) * Weight(Ag) + Count(Hg) * Weight(Hg) + Count(Pb) * Weight(Pb) + Count(Ar) * Weight(Ar) + Count(Ne) * Weight(Ne) + Count(He) * Weight(He) + Count(Ce) * Weight(Ce) + Count(Br) * Weight(Br) + Count(Cu) * Weight(Cu) + Count(Fe) * Weight(Fe) + Count(K) * Weight(K) + Count(P) * Weight(P) + Count(V) * Weight(V) + Count(I) * Weight(I) + Count(C) * Weight(C) + Count(Zn) * Weight(Zn) + Count(Ir) * Weight(Ir) =
1 * 1.00794 + 2 * 15.9994 + 1 * 35.453 + 2 * 196.966569 + 1 * 107.8682 + 1 * 200.59 + 1 * 207.2 + 1 * 39.948 + 1 * 20.1797 + 1 * 4.002602 + 1 * 140.116 + 1 * 79.904 + 1 * 63.546 + 1 * 55.845 + 1 * 39.0983 + 1 * 30.973762 + 1 * 50.9415 + 1 * 126.90447 + 1 * 12.0107 + 1 * 65.38 + 1 * 192.217 =
1899.1181 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgArAu2BrCeClCuFeHeHgIIrKNeO2PPbVZn

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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