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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of LiBeBCNOFNeCaNaMgAlSIPSClArKCaHSCDsLrNOMdFmEsCFBKCmAmPUNPUPa is 3332.6214 g/mol

Convert between LiBeBCNOFNeCaNaMgAlSIPSClArKCaHSCDsLrNOMdFmEsCFBKCmAmPUNPUPa weight and moles
CompoundMolesWeight, g
LiBeBCNOFNeCaNaMgAlSIPSClArKCaHSCDsLrNOMdFmEsCFBKCmAmPUNPUPa

Elemental composition of LiBeBCNOFNeCaNaMgAlSIPSClArKCaHSCDsLrNOMdFmEsCFBKCmAmPUNPUPa
ElementSymbolAtomic weightAtomsMass percent
LithiumLi6.94110.2083
BerylliumBe9.01218210.2704
BoronB10.81120.6488
CarbonC12.010731.0812
NitrogenN14.006731.2609
OxygenO15.999420.9602
FluorineF18.998403221.1401
NeonNe20.179710.6055
CalciumCa40.07822.4052
SodiumNa22.9897692810.6898
MagnesiumMg24.305010.7293
AluminumAl26.981538610.8096
SulfurS32.06532.8865
IodineI126.9044713.8079
PhosphorusP30.97376232.7882
ChlorineCl35.45311.0638
ArgonAr39.94811.1987
PotassiumK39.098322.3464
HydrogenH1.0079410.0302
DarmstadtiumDs281.162118.4367
LawrenciumLr262.109617.8650
MendeleviumMd258.09843117.7446
FermiumFm257.09510517.7145
EinsteiniumEs252.0829817.5641
CuriumCm243.06138917.2934
AmericiumAm241.05682917.2332
UraniumU238.02891214.2848
ProtactiniumPa231.0358816.9326

Computing molar mass step by step

First, compute the number of each atom in LiBeBCNOFNeCaNaMgAlSIPSClArKCaHSCDsLrNOMdFmEsCFBKCmAmPUNPUPa:
Li: 1, Be: 1, B: 2, C: 3, N: 3, O: 2, F: 2, Ne: 1, Ca: 2, Na: 1, Mg: 1, Al: 1, S: 3, I: 1, P: 3, Cl: 1, Ar: 1, K: 2, H: 1, Ds: 1, Lr: 1, Md: 1, Fm: 1, Es: 1, Cm: 1, Am: 1, U: 2, Pa: 1

Then, lookup atomic weights for each element in periodic table:
Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Ca: 40.078, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, S: 32.065, I: 126.90447, P: 30.973762, Cl: 35.453, Ar: 39.948, K: 39.0983, H: 1.00794, Ds: 281.16206, Lr: 262.10963, Md: 258.098431, Fm: 257.095105, Es: 252.08298, Cm: 243.0613891, Am: 241.0568291, U: 238.02891, Pa: 231.03588

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (LiBeBCNOFNeCaNaMgAlSIPSClArKCaHSCDsLrNOMdFmEsCFBKCmAmPUNPUPa) = ∑ Counti * Weighti =
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(Ne) * Weight(Ne) + Count(Ca) * Weight(Ca) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(S) * Weight(S) + Count(I) * Weight(I) + Count(P) * Weight(P) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + Count(H) * Weight(H) + Count(Ds) * Weight(Ds) + Count(Lr) * Weight(Lr) + Count(Md) * Weight(Md) + Count(Fm) * Weight(Fm) + Count(Es) * Weight(Es) + Count(Cm) * Weight(Cm) + Count(Am) * Weight(Am) + Count(U) * Weight(U) + Count(Pa) * Weight(Pa) =
1 * 6.941 + 1 * 9.012182 + 2 * 10.811 + 3 * 12.0107 + 3 * 14.0067 + 2 * 15.9994 + 2 * 18.9984032 + 1 * 20.1797 + 2 * 40.078 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 3 * 32.065 + 1 * 126.90447 + 3 * 30.973762 + 1 * 35.453 + 1 * 39.948 + 2 * 39.0983 + 1 * 1.00794 + 1 * 281.16206 + 1 * 262.10963 + 1 * 258.098431 + 1 * 257.095105 + 1 * 252.08298 + 1 * 243.0613891 + 1 * 241.0568291 + 2 * 238.02891 + 1 * 231.03588 =
3332.6214 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C3HAlAmArB2BeCa2ClCmDsEsF2FmIK2LiLrMdMgN3NaNeO2P3PaS3U2

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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