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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLrNoMdFmEsCfBkCmAmPuNpUPaThAcRaFrRnAtPoBiPbTlHgAuPtIrOsReWI is 6843.5933 g/mol

Convert between HLrNoMdFmEsCfBkCmAmPuNpUPaThAcRaFrRnAtPoBiPbTlHgAuPtIrOsReWI weight and moles
CompoundMolesWeight, g
HLrNoMdFmEsCfBkCmAmPuNpUPaThAcRaFrRnAtPoBiPbTlHgAuPtIrOsReWI

Elemental composition of HLrNoMdFmEsCfBkCmAmPuNpUPaThAcRaFrRnAtPoBiPbTlHgAuPtIrOsReWI
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0147
LawrenciumLr262.109613.8300
NobeliumNo259.101013.7860
MendeleviumMd258.09843113.7714
FermiumFm257.09510513.7567
EinsteiniumEs252.0829813.6835
CaliforniumCf249.07485313.6395
BerkeliumBk247.07030713.6102
CuriumCm243.06138913.5517
AmericiumAm241.05682913.5224
PlutoniumPu238.04956013.4784
NeptuniumNp236.0465713.4492
UraniumU238.0289113.4781
ProtactiniumPa231.0358813.3759
ThoriumTh232.0380613.3906
ActiniumAc227.02775213.3174
RadiumRa226.02541013.3027
FranciumFr223.01973613.2588
RadonRn210.99060113.0830
AstatineAt209.98714813.0684
PoloniumPo208.98243013.0537
BismuthBi208.9804013.0537
LeadPb207.213.0276
ThalliumTl204.383312.9865
MercuryHg200.5912.9311
GoldAu196.96656912.8781
PlatinumPt195.08412.8506
IridiumIr192.21712.8087
OsmiumOs190.2312.7797
RheniumRe186.20712.7209
TungstenW183.8412.6863
IodineI126.9044711.8544

Computing molar mass step by step

First, compute the number of each atom in HLrNoMdFmEsCfBkCmAmPuNpUPaThAcRaFrRnAtPoBiPbTlHgAuPtIrOsReWI:
H: 1, Lr: 1, No: 1, Md: 1, Fm: 1, Es: 1, Cf: 1, Bk: 1, Cm: 1, Am: 1, Pu: 1, Np: 1, U: 1, Pa: 1, Th: 1, Ac: 1, Ra: 1, Fr: 1, Rn: 1, At: 1, Po: 1, Bi: 1, Pb: 1, Tl: 1, Hg: 1, Au: 1, Pt: 1, Ir: 1, Os: 1, Re: 1, W: 1, I: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Lr: 262.10963, No: 259.10103, Md: 258.098431, Fm: 257.095105, Es: 252.08298, Cf: 249.0748535, Bk: 247.070307, Cm: 243.0613891, Am: 241.0568291, Pu: 238.0495599, Np: 236.04657, U: 238.02891, Pa: 231.03588, Th: 232.03806, Ac: 227.0277521, Ra: 226.0254098, Fr: 223.0197359, Rn: 210.990601, At: 209.987148, Po: 208.9824304, Bi: 208.9804, Pb: 207.2, Tl: 204.3833, Hg: 200.59, Au: 196.966569, Pt: 195.084, Ir: 192.217, Os: 190.23, Re: 186.207, W: 183.84, I: 126.90447

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HLrNoMdFmEsCfBkCmAmPuNpUPaThAcRaFrRnAtPoBiPbTlHgAuPtIrOsReWI) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(Lr) * Weight(Lr) + Count(No) * Weight(No) + Count(Md) * Weight(Md) + Count(Fm) * Weight(Fm) + Count(Es) * Weight(Es) + Count(Cf) * Weight(Cf) + Count(Bk) * Weight(Bk) + Count(Cm) * Weight(Cm) + Count(Am) * Weight(Am) + Count(Pu) * Weight(Pu) + Count(Np) * Weight(Np) + Count(U) * Weight(U) + Count(Pa) * Weight(Pa) + Count(Th) * Weight(Th) + Count(Ac) * Weight(Ac) + Count(Ra) * Weight(Ra) + Count(Fr) * Weight(Fr) + Count(Rn) * Weight(Rn) + Count(At) * Weight(At) + Count(Po) * Weight(Po) + Count(Bi) * Weight(Bi) + Count(Pb) * Weight(Pb) + Count(Tl) * Weight(Tl) + Count(Hg) * Weight(Hg) + Count(Au) * Weight(Au) + Count(Pt) * Weight(Pt) + Count(Ir) * Weight(Ir) + Count(Os) * Weight(Os) + Count(Re) * Weight(Re) + Count(W) * Weight(W) + Count(I) * Weight(I) =
1 * 1.00794 + 1 * 262.10963 + 1 * 259.10103 + 1 * 258.098431 + 1 * 257.095105 + 1 * 252.08298 + 1 * 249.0748535 + 1 * 247.070307 + 1 * 243.0613891 + 1 * 241.0568291 + 1 * 238.0495599 + 1 * 236.04657 + 1 * 238.02891 + 1 * 231.03588 + 1 * 232.03806 + 1 * 227.0277521 + 1 * 226.0254098 + 1 * 223.0197359 + 1 * 210.990601 + 1 * 209.987148 + 1 * 208.9824304 + 1 * 208.9804 + 1 * 207.2 + 1 * 204.3833 + 1 * 200.59 + 1 * 196.966569 + 1 * 195.084 + 1 * 192.217 + 1 * 190.23 + 1 * 186.207 + 1 * 183.84 + 1 * 126.90447 =
6843.5933 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAmAtAuBiBkCfCmEsFmFrHHgIIrLrMdNoNpOsPaPbPoPtPuRaReRnThTlUW

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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