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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of NaClPbKFLiMgGaHgILaCePrAcThPaNdUPmNpSmPuEuGdAmCmTbBkDyCfHoEs is 5041.7896 g/mol

Convert between NaClPbKFLiMgGaHgILaCePrAcThPaNdUPmNpSmPuEuGdAmCmTbBkDyCfHoEs weight and moles
CompoundMolesWeight, g
NaClPbKFLiMgGaHgILaCePrAcThPaNdUPmNpSmPuEuGdAmCmTbBkDyCfHoEs

Elemental composition of NaClPbKFLiMgGaHgILaCePrAcThPaNdUPmNpSmPuEuGdAmCmTbBkDyCfHoEs
ElementSymbolAtomic weightAtomsMass percent
SodiumNa22.9897692810.4560
ChlorineCl35.45310.7032
LeadPb207.214.1097
PotassiumK39.098310.7755
FluorineF18.998403210.3768
LithiumLi6.94110.1377
MagnesiumMg24.305010.4821
GalliumGa69.72311.3829
MercuryHg200.5913.9785
IodineI126.9044712.5171
LanthanumLa138.9054712.7551
CeriumCe140.11612.7791
PraseodymiumPr140.9076512.7948
ActiniumAc227.02775214.5029
ThoriumTh232.0380614.6023
ProtactiniumPa231.0358814.5824
NeodymiumNd144.24212.8609
UraniumU238.0289114.7211
PromethiumPm144.91274912.8742
NeptuniumNp236.0465714.6818
SamariumSm150.3612.9823
PlutoniumPu238.04956014.7215
EuropiumEu151.96413.0141
GadoliniumGd157.2513.1189
AmericiumAm241.05682914.7812
CuriumCm243.06138914.8209
TerbiumTb158.9253513.1522
BerkeliumBk247.07030714.9004
DysprosiumDy162.50013.2231
CaliforniumCf249.07485314.9402
HolmiumHo164.9303213.2713
EinsteiniumEs252.0829814.9999

Computing molar mass step by step

First, compute the number of each atom in NaClPbKFLiMgGaHgILaCePrAcThPaNdUPmNpSmPuEuGdAmCmTbBkDyCfHoEs:
Na: 1, Cl: 1, Pb: 1, K: 1, F: 1, Li: 1, Mg: 1, Ga: 1, Hg: 1, I: 1, La: 1, Ce: 1, Pr: 1, Ac: 1, Th: 1, Pa: 1, Nd: 1, U: 1, Pm: 1, Np: 1, Sm: 1, Pu: 1, Eu: 1, Gd: 1, Am: 1, Cm: 1, Tb: 1, Bk: 1, Dy: 1, Cf: 1, Ho: 1, Es: 1

Then, lookup atomic weights for each element in periodic table:
Na: 22.98976928, Cl: 35.453, Pb: 207.2, K: 39.0983, F: 18.9984032, Li: 6.941, Mg: 24.305, Ga: 69.723, Hg: 200.59, I: 126.90447, La: 138.90547, Ce: 140.116, Pr: 140.90765, Ac: 227.0277521, Th: 232.03806, Pa: 231.03588, Nd: 144.242, U: 238.02891, Pm: 144.912749, Np: 236.04657, Sm: 150.36, Pu: 238.0495599, Eu: 151.964, Gd: 157.25, Am: 241.0568291, Cm: 243.0613891, Tb: 158.92535, Bk: 247.070307, Dy: 162.5, Cf: 249.0748535, Ho: 164.93032, Es: 252.08298

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (NaClPbKFLiMgGaHgILaCePrAcThPaNdUPmNpSmPuEuGdAmCmTbBkDyCfHoEs) = ∑ Counti * Weighti =
Count(Na) * Weight(Na) + Count(Cl) * Weight(Cl) + Count(Pb) * Weight(Pb) + Count(K) * Weight(K) + Count(F) * Weight(F) + Count(Li) * Weight(Li) + Count(Mg) * Weight(Mg) + Count(Ga) * Weight(Ga) + Count(Hg) * Weight(Hg) + Count(I) * Weight(I) + Count(La) * Weight(La) + Count(Ce) * Weight(Ce) + Count(Pr) * Weight(Pr) + Count(Ac) * Weight(Ac) + Count(Th) * Weight(Th) + Count(Pa) * Weight(Pa) + Count(Nd) * Weight(Nd) + Count(U) * Weight(U) + Count(Pm) * Weight(Pm) + Count(Np) * Weight(Np) + Count(Sm) * Weight(Sm) + Count(Pu) * Weight(Pu) + Count(Eu) * Weight(Eu) + Count(Gd) * Weight(Gd) + Count(Am) * Weight(Am) + Count(Cm) * Weight(Cm) + Count(Tb) * Weight(Tb) + Count(Bk) * Weight(Bk) + Count(Dy) * Weight(Dy) + Count(Cf) * Weight(Cf) + Count(Ho) * Weight(Ho) + Count(Es) * Weight(Es) =
1 * 22.98976928 + 1 * 35.453 + 1 * 207.2 + 1 * 39.0983 + 1 * 18.9984032 + 1 * 6.941 + 1 * 24.305 + 1 * 69.723 + 1 * 200.59 + 1 * 126.90447 + 1 * 138.90547 + 1 * 140.116 + 1 * 140.90765 + 1 * 227.0277521 + 1 * 232.03806 + 1 * 231.03588 + 1 * 144.242 + 1 * 238.02891 + 1 * 144.912749 + 1 * 236.04657 + 1 * 150.36 + 1 * 238.0495599 + 1 * 151.964 + 1 * 157.25 + 1 * 241.0568291 + 1 * 243.0613891 + 1 * 158.92535 + 1 * 247.070307 + 1 * 162.5 + 1 * 249.0748535 + 1 * 164.93032 + 1 * 252.08298 =
5041.7896 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAmBkCeCfClCmDyEsEuFGaGdHgHoIKLaLiMgNaNdNpPaPbPmPrPuSmTbThU

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, 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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