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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HUusLvUupFlUutCnRgDsMtHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNpUPaThI is 7194.9274 g/mol

Convert between HUusLvUupFlUutCnRgDsMtHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNpUPaThI weight and moles
CompoundMolesWeight, g
HUusLvUupFlUutCnRgDsMtHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNpUPaThI

Elemental composition of HUusLvUupFlUutCnRgDsMtHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNpUPaThI
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0140
TennessineUus292.20814.0613
LivermoriumLv0.000000010.0000
MoscoviumUup288.192514.0055
FleroviumFl289.187314.0193
NihoniumUut284.178113.9497
CoperniciumCn285.174113.9635
RoentgeniumRg280.164513.8939
DarmstadtiumDs281.162113.9078
MeitneriumMt276.151213.8381
HassiumHs270.134713.7545
BohriumBh272.138013.7824
SeaborgiumSg271.133513.7684
DubniumDb268.125513.7266
RutherfordiumRf265.116713.6848
LawrenciumLr262.109613.6430
NobeliumNo259.101013.6012
MendeleviumMd258.09843113.5872
FermiumFm257.09510513.5733
EinsteiniumEs252.0829813.5036
CaliforniumCf249.07485313.4618
BerkeliumBk247.07030713.4340
CuriumCm243.06138913.3782
AmericiumAm241.05682913.3504
PlutoniumPu238.04956013.3086
NeptuniumNp236.0465713.2807
UraniumU238.0289113.3083
ProtactiniumPa231.0358813.2111
ThoriumTh232.0380613.2250
IodineI126.9044711.7638

Computing molar mass step by step

First, compute the number of each atom in HUusLvUupFlUutCnRgDsMtHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNpUPaThI:
H: 1, Uus: 1, Lv: 1, Uup: 1, Fl: 1, Uut: 1, Cn: 1, Rg: 1, Ds: 1, Mt: 1, Hs: 1, Bh: 1, Sg: 1, Db: 1, Rf: 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, I: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Uus: 292.20755, Lv: 0, Uup: 288.19249, Fl: 289.18728, Uut: 284.17808, Cn: 285.17411, Rg: 280.16447, Ds: 281.16206, Mt: 276.15116, Hs: 270.13465, Bh: 272.13803, Sg: 271.13347, Db: 268.12545, Rf: 265.1167, 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, I: 126.90447

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HUusLvUupFlUutCnRgDsMtHsBhSgDbRfLrNoMdFmEsCfBkCmAmPuNpUPaThI) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(Uus) * Weight(Uus) + Count(Lv) * Weight(Lv) + Count(Uup) * Weight(Uup) + Count(Fl) * Weight(Fl) + Count(Uut) * Weight(Uut) + Count(Cn) * Weight(Cn) + Count(Rg) * Weight(Rg) + Count(Ds) * Weight(Ds) + Count(Mt) * Weight(Mt) + Count(Hs) * Weight(Hs) + Count(Bh) * Weight(Bh) + Count(Sg) * Weight(Sg) + Count(Db) * Weight(Db) + Count(Rf) * Weight(Rf) + 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(I) * Weight(I) =
1 * 1.00794 + 1 * 292.20755 + 1 * 0 + 1 * 288.19249 + 1 * 289.18728 + 1 * 284.17808 + 1 * 285.17411 + 1 * 280.16447 + 1 * 281.16206 + 1 * 276.15116 + 1 * 270.13465 + 1 * 272.13803 + 1 * 271.13347 + 1 * 268.12545 + 1 * 265.1167 + 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 * 126.90447 =
7194.9274 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AmBhBkCfCmCnDbDsEsFlFmHHsILrLvMdMtNoNpPaPuRfRgSgThUUupUusUut

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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