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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv is 7022.5218 g/mol

Convert between HHoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv weight and moles
CompoundMolesWeight, g
HHoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv

Elemental composition of HHoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0144
HolmiumHo164.9303212.3486
ErbiumEr167.25912.3818
ThuliumTm168.9342112.4056
YtterbiumYb173.05412.4643
LutetiumLu174.966812.4915
ActiniumAc227.02775213.2329
ThoriumTh232.0380613.3042
ProtactiniumPa231.0358813.2899
UraniumU238.0289113.3895
NeptuniumNp236.0465713.3613
PlutoniumPu238.04956013.3898
AmericiumAm241.05682913.4326
CuriumCm243.06138913.4612
BerkeliumBk247.07030713.5183
CaliforniumCf249.07485313.5468
EinsteiniumEs252.0829813.5896
MendeleviumMd258.09843113.6753
NobeliumNo259.101013.6896
LawrenciumLr262.109613.7324
RutherfordiumRf265.116713.7752
DubniumDb268.125513.8181
SeaborgiumSg271.133513.8609
BohriumBh272.138013.8752
HassiumHs270.134713.8467
MeitneriumMt276.151213.9324
DarmstadtiumDs281.162114.0037
RoentgeniumRg280.164513.9895
CoperniciumCn285.174114.0609
FleroviumFl289.187314.1180
LivermoriumLv0.000000010.0000

Computing molar mass step by step

First, compute the number of each atom in HHoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv:
H: 1, Ho: 1, Er: 1, Tm: 1, Yb: 1, Lu: 1, Ac: 1, Th: 1, Pa: 1, U: 1, Np: 1, Pu: 1, Am: 1, Cm: 1, Bk: 1, Cf: 1, Es: 1, Md: 1, No: 1, Lr: 1, Rf: 1, Db: 1, Sg: 1, Bh: 1, Hs: 1, Mt: 1, Ds: 1, Rg: 1, Cn: 1, Fl: 1, Lv: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Ho: 164.93032, Er: 167.259, Tm: 168.93421, Yb: 173.054, Lu: 174.9668, Ac: 227.0277521, Th: 232.03806, Pa: 231.03588, U: 238.02891, Np: 236.04657, Pu: 238.0495599, Am: 241.0568291, Cm: 243.0613891, Bk: 247.070307, Cf: 249.0748535, Es: 252.08298, Md: 258.098431, No: 259.10103, Lr: 262.10963, Rf: 265.1167, Db: 268.12545, Sg: 271.13347, Bh: 272.13803, Hs: 270.13465, Mt: 276.15116, Ds: 281.16206, Rg: 280.16447, Cn: 285.17411, Fl: 289.18728, Lv: 0

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHoErTmYbLuAcThPaUNpPuAmCmBkCfEsMdNoLrRfDbSgBhHsMtDsRgCnFlLv) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(Ho) * Weight(Ho) + Count(Er) * Weight(Er) + Count(Tm) * Weight(Tm) + Count(Yb) * Weight(Yb) + Count(Lu) * Weight(Lu) + Count(Ac) * Weight(Ac) + Count(Th) * Weight(Th) + Count(Pa) * Weight(Pa) + Count(U) * Weight(U) + Count(Np) * Weight(Np) + Count(Pu) * Weight(Pu) + Count(Am) * Weight(Am) + Count(Cm) * Weight(Cm) + Count(Bk) * Weight(Bk) + Count(Cf) * Weight(Cf) + Count(Es) * Weight(Es) + Count(Md) * Weight(Md) + Count(No) * Weight(No) + Count(Lr) * Weight(Lr) + Count(Rf) * Weight(Rf) + Count(Db) * Weight(Db) + Count(Sg) * Weight(Sg) + Count(Bh) * Weight(Bh) + Count(Hs) * Weight(Hs) + Count(Mt) * Weight(Mt) + Count(Ds) * Weight(Ds) + Count(Rg) * Weight(Rg) + Count(Cn) * Weight(Cn) + Count(Fl) * Weight(Fl) + Count(Lv) * Weight(Lv) =
1 * 1.00794 + 1 * 164.93032 + 1 * 167.259 + 1 * 168.93421 + 1 * 173.054 + 1 * 174.9668 + 1 * 227.0277521 + 1 * 232.03806 + 1 * 231.03588 + 1 * 238.02891 + 1 * 236.04657 + 1 * 238.0495599 + 1 * 241.0568291 + 1 * 243.0613891 + 1 * 247.070307 + 1 * 249.0748535 + 1 * 252.08298 + 1 * 258.098431 + 1 * 259.10103 + 1 * 262.10963 + 1 * 265.1167 + 1 * 268.12545 + 1 * 271.13347 + 1 * 272.13803 + 1 * 270.13465 + 1 * 276.15116 + 1 * 281.16206 + 1 * 280.16447 + 1 * 285.17411 + 1 * 289.18728 + 1 * 0 =
7022.5218 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAmBhBkCfCmCnDbDsErEsFlHHoHsLrLuLvMdMtNoNpPaPuRfRgSgThTmUYb

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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