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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of C8H2BeBrClCrCuDbFFeFrHfHgILi3LuMnNa2O2OsP2PbPoSnTcTeTiTmUVC8 is 3352.1255 g/mol

Convert between C8H2BeBrClCrCuDbFFeFrHfHgILi3LuMnNa2O2OsP2PbPoSnTcTeTiTmUVC8 weight and moles
CompoundMolesWeight, g
C8H2BeBrClCrCuDbFFeFrHfHgILi3LuMnNa2O2OsP2PbPoSnTcTeTiTmUVC8

Elemental composition of C8H2BeBrClCrCuDbFFeFrHfHgILi3LuMnNa2O2OsP2PbPoSnTcTeTiTmUVC8
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.0107165.7328
HydrogenH1.0079420.0601
BerylliumBe9.01218210.2688
BromineBr79.90412.3837
ChlorineCl35.45311.0576
ChromiumCr51.996111.5511
CopperCu63.54611.8957
DubniumDb268.125517.9987
FluorineF18.998403210.5668
IronFe55.84511.6660
FranciumFr223.01973616.6531
HafniumHf178.4915.3247
MercuryHg200.5915.9840
IodineI126.9044713.7858
LithiumLi6.94130.6212
LutetiumLu174.966815.2196
ManganeseMn54.93804511.6389
SodiumNa22.9897692821.3717
OxygenO15.999420.9546
OsmiumOs190.2315.6749
PhosphorusP30.97376221.8480
LeadPb207.216.1812
PoloniumPo208.98243016.2343
TinSn118.71013.5413
TechnetiumTc96.90636512.8909
TelluriumTe127.6013.8065
TitaniumTi47.86711.4280
ThuliumTm168.9342115.0396
UraniumU238.0289117.1008
VanadiumV50.941511.5197

Computing molar mass step by step

First, compute the number of each atom in C8H2BeBrClCrCuDbFFeFrHfHgILi3LuMnNa2O2OsP2PbPoSnTcTeTiTmUVC8:
C: 16, H: 2, Be: 1, Br: 1, Cl: 1, Cr: 1, Cu: 1, Db: 1, F: 1, Fe: 1, Fr: 1, Hf: 1, Hg: 1, I: 1, Li: 3, Lu: 1, Mn: 1, Na: 2, O: 2, Os: 1, P: 2, Pb: 1, Po: 1, Sn: 1, Tc: 1, Te: 1, Ti: 1, Tm: 1, U: 1, V: 1

Then, lookup atomic weights for each element in periodic table:
C: 12.0107, H: 1.00794, Be: 9.012182, Br: 79.904, Cl: 35.453, Cr: 51.9961, Cu: 63.546, Db: 268.12545, F: 18.9984032, Fe: 55.845, Fr: 223.0197359, Hf: 178.49, Hg: 200.59, I: 126.90447, Li: 6.941, Lu: 174.9668, Mn: 54.938045, Na: 22.98976928, O: 15.9994, Os: 190.23, P: 30.973762, Pb: 207.2, Po: 208.9824304, Sn: 118.71, Tc: 96.906365, Te: 127.6, Ti: 47.867, Tm: 168.93421, U: 238.02891, V: 50.9415

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (C8H2BeBrClCrCuDbFFeFrHfHgILi3LuMnNa2O2OsP2PbPoSnTcTeTiTmUVC8) = ∑ Counti * Weighti =
Count(C) * Weight(C) + Count(H) * Weight(H) + Count(Be) * Weight(Be) + Count(Br) * Weight(Br) + Count(Cl) * Weight(Cl) + Count(Cr) * Weight(Cr) + Count(Cu) * Weight(Cu) + Count(Db) * Weight(Db) + Count(F) * Weight(F) + Count(Fe) * Weight(Fe) + Count(Fr) * Weight(Fr) + Count(Hf) * Weight(Hf) + Count(Hg) * Weight(Hg) + Count(I) * Weight(I) + Count(Li) * Weight(Li) + Count(Lu) * Weight(Lu) + Count(Mn) * Weight(Mn) + Count(Na) * Weight(Na) + Count(O) * Weight(O) + Count(Os) * Weight(Os) + Count(P) * Weight(P) + Count(Pb) * Weight(Pb) + Count(Po) * Weight(Po) + Count(Sn) * Weight(Sn) + Count(Tc) * Weight(Tc) + Count(Te) * Weight(Te) + Count(Ti) * Weight(Ti) + Count(Tm) * Weight(Tm) + Count(U) * Weight(U) + Count(V) * Weight(V) =
16 * 12.0107 + 2 * 1.00794 + 1 * 9.012182 + 1 * 79.904 + 1 * 35.453 + 1 * 51.9961 + 1 * 63.546 + 1 * 268.12545 + 1 * 18.9984032 + 1 * 55.845 + 1 * 223.0197359 + 1 * 178.49 + 1 * 200.59 + 1 * 126.90447 + 3 * 6.941 + 1 * 174.9668 + 1 * 54.938045 + 2 * 22.98976928 + 2 * 15.9994 + 1 * 190.23 + 2 * 30.973762 + 1 * 207.2 + 1 * 208.9824304 + 1 * 118.71 + 1 * 96.906365 + 1 * 127.6 + 1 * 47.867 + 1 * 168.93421 + 1 * 238.02891 + 1 * 50.9415 =
3352.1255 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C16H2BeBrClCrCuDbFFeFrHfHgILi3LuMnNa2O2OsP2PbPoSnTcTeTiTmUV

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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