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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of DsDbULrWTbTmLuIrReRnCnMdAmCmNdLaPuThPmPrPaSgBhGdPoHgBiPb is 6149.2635 g/mol

Convert between DsDbULrWTbTmLuIrReRnCnMdAmCmNdLaPuThPmPrPaSgBhGdPoHgBiPb weight and moles
CompoundMolesWeight, g
DsDbULrWTbTmLuIrReRnCnMdAmCmNdLaPuThPmPrPaSgBhGdPoHgBiPb

Elemental composition of DsDbULrWTbTmLuIrReRnCnMdAmCmNdLaPuThPmPrPaSgBhGdPoHgBiPb
ElementSymbolAtomic weightAtomsMass percent
DarmstadtiumDs281.162114.5723
DubniumDb268.125514.3603
UraniumU238.0289113.8709
LawrenciumLr262.109614.2625
TungstenW183.8412.9896
TerbiumTb158.9253512.5845
ThuliumTm168.9342112.7472
LutetiumLu174.966812.8453
IridiumIr192.21713.1259
RheniumRe186.20713.0281
RadonRn210.99060113.4312
CoperniciumCn285.174114.6375
MendeleviumMd258.09843114.1972
AmericiumAm241.05682913.9201
CuriumCm243.06138913.9527
NeodymiumNd144.24212.3457
LanthanumLa138.9054712.2589
PlutoniumPu238.04956013.8712
ThoriumTh232.0380613.7734
PromethiumPm144.91274912.3566
PraseodymiumPr140.9076512.2915
ProtactiniumPa231.0358813.7571
SeaborgiumSg271.133514.4092
BohriumBh272.138014.4255
GadoliniumGd157.2512.5572
PoloniumPo208.98243013.3985
MercuryHg200.5913.2620
BismuthBi208.9804013.3985
LeadPb207.213.3695

Computing molar mass step by step

First, compute the number of each atom in DsDbULrWTbTmLuIrReRnCnMdAmCmNdLaPuThPmPrPaSgBhGdPoHgBiPb:
Ds: 1, Db: 1, U: 1, Lr: 1, W: 1, Tb: 1, Tm: 1, Lu: 1, Ir: 1, Re: 1, Rn: 1, Cn: 1, Md: 1, Am: 1, Cm: 1, Nd: 1, La: 1, Pu: 1, Th: 1, Pm: 1, Pr: 1, Pa: 1, Sg: 1, Bh: 1, Gd: 1, Po: 1, Hg: 1, Bi: 1, Pb: 1

Then, lookup atomic weights for each element in periodic table:
Ds: 281.16206, Db: 268.12545, U: 238.02891, Lr: 262.10963, W: 183.84, Tb: 158.92535, Tm: 168.93421, Lu: 174.9668, Ir: 192.217, Re: 186.207, Rn: 210.990601, Cn: 285.17411, Md: 258.098431, Am: 241.0568291, Cm: 243.0613891, Nd: 144.242, La: 138.90547, Pu: 238.0495599, Th: 232.03806, Pm: 144.912749, Pr: 140.90765, Pa: 231.03588, Sg: 271.13347, Bh: 272.13803, Gd: 157.25, Po: 208.9824304, Hg: 200.59, Bi: 208.9804, Pb: 207.2

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (DsDbULrWTbTmLuIrReRnCnMdAmCmNdLaPuThPmPrPaSgBhGdPoHgBiPb) = ∑ Counti * Weighti =
Count(Ds) * Weight(Ds) + Count(Db) * Weight(Db) + Count(U) * Weight(U) + Count(Lr) * Weight(Lr) + Count(W) * Weight(W) + Count(Tb) * Weight(Tb) + Count(Tm) * Weight(Tm) + Count(Lu) * Weight(Lu) + Count(Ir) * Weight(Ir) + Count(Re) * Weight(Re) + Count(Rn) * Weight(Rn) + Count(Cn) * Weight(Cn) + Count(Md) * Weight(Md) + Count(Am) * Weight(Am) + Count(Cm) * Weight(Cm) + Count(Nd) * Weight(Nd) + Count(La) * Weight(La) + Count(Pu) * Weight(Pu) + Count(Th) * Weight(Th) + Count(Pm) * Weight(Pm) + Count(Pr) * Weight(Pr) + Count(Pa) * Weight(Pa) + Count(Sg) * Weight(Sg) + Count(Bh) * Weight(Bh) + Count(Gd) * Weight(Gd) + Count(Po) * Weight(Po) + Count(Hg) * Weight(Hg) + Count(Bi) * Weight(Bi) + Count(Pb) * Weight(Pb) =
1 * 281.16206 + 1 * 268.12545 + 1 * 238.02891 + 1 * 262.10963 + 1 * 183.84 + 1 * 158.92535 + 1 * 168.93421 + 1 * 174.9668 + 1 * 192.217 + 1 * 186.207 + 1 * 210.990601 + 1 * 285.17411 + 1 * 258.098431 + 1 * 241.0568291 + 1 * 243.0613891 + 1 * 144.242 + 1 * 138.90547 + 1 * 238.0495599 + 1 * 232.03806 + 1 * 144.912749 + 1 * 140.90765 + 1 * 231.03588 + 1 * 271.13347 + 1 * 272.13803 + 1 * 157.25 + 1 * 208.9824304 + 1 * 200.59 + 1 * 208.9804 + 1 * 207.2 =
6149.2635 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AmBhBiCmCnDbDsGdHgIrLaLrLuMdNdPaPbPmPoPrPuReRnSgTbThTmUW

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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