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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of La2Hg3Pb2Ca3Ba5Cu3Ce3U2Ru3Pd5Al3Gd5Co5Pu2Th3Tm2Fe5Sb3Se3S8 is 7833.0511 g/mol

Convert between La2Hg3Pb2Ca3Ba5Cu3Ce3U2Ru3Pd5Al3Gd5Co5Pu2Th3Tm2Fe5Sb3Se3S8 weight and moles
CompoundMolesWeight, g
La2Hg3Pb2Ca3Ba5Cu3Ce3U2Ru3Pd5Al3Gd5Co5Pu2Th3Tm2Fe5Sb3Se3S8

Elemental composition of La2Hg3Pb2Ca3Ba5Cu3Ce3U2Ru3Pd5Al3Gd5Co5Pu2Th3Tm2Fe5Sb3Se3S8
ElementSymbolAtomic weightAtomsMass percent
LanthanumLa138.9054723.5467
MercuryHg200.5937.6824
LeadPb207.225.2904
CalciumCa40.07831.5350
BariumBa137.32758.7659
CopperCu63.54632.4338
CeriumCe140.11635.3663
UraniumU238.0289126.0776
RutheniumRu101.0733.8709
PalladiumPd106.4256.7930
AluminumAl26.981538631.0334
GadoliniumGd157.25510.0376
CobaltCo58.93319553.7618
PlutoniumPu238.04956026.0781
ThoriumTh232.0380638.8869
ThuliumTm168.9342124.3134
IronFe55.84553.5647
AntimonySb121.76034.6633
SeleniumSe78.9633.0241
SulfurS32.06583.2748

Computing molar mass step by step

First, compute the number of each atom in La2Hg3Pb2Ca3Ba5Cu3Ce3U2Ru3Pd5Al3Gd5Co5Pu2Th3Tm2Fe5Sb3Se3S8:
La: 2, Hg: 3, Pb: 2, Ca: 3, Ba: 5, Cu: 3, Ce: 3, U: 2, Ru: 3, Pd: 5, Al: 3, Gd: 5, Co: 5, Pu: 2, Th: 3, Tm: 2, Fe: 5, Sb: 3, Se: 3, S: 8

Then, lookup atomic weights for each element in periodic table:
La: 138.90547, Hg: 200.59, Pb: 207.2, Ca: 40.078, Ba: 137.327, Cu: 63.546, Ce: 140.116, U: 238.02891, Ru: 101.07, Pd: 106.42, Al: 26.9815386, Gd: 157.25, Co: 58.933195, Pu: 238.0495599, Th: 232.03806, Tm: 168.93421, Fe: 55.845, Sb: 121.76, Se: 78.96, S: 32.065

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (La2Hg3Pb2Ca3Ba5Cu3Ce3U2Ru3Pd5Al3Gd5Co5Pu2Th3Tm2Fe5Sb3Se3S8) = ∑ Counti * Weighti =
Count(La) * Weight(La) + Count(Hg) * Weight(Hg) + Count(Pb) * Weight(Pb) + Count(Ca) * Weight(Ca) + Count(Ba) * Weight(Ba) + Count(Cu) * Weight(Cu) + Count(Ce) * Weight(Ce) + Count(U) * Weight(U) + Count(Ru) * Weight(Ru) + Count(Pd) * Weight(Pd) + Count(Al) * Weight(Al) + Count(Gd) * Weight(Gd) + Count(Co) * Weight(Co) + Count(Pu) * Weight(Pu) + Count(Th) * Weight(Th) + Count(Tm) * Weight(Tm) + Count(Fe) * Weight(Fe) + Count(Sb) * Weight(Sb) + Count(Se) * Weight(Se) + Count(S) * Weight(S) =
2 * 138.90547 + 3 * 200.59 + 2 * 207.2 + 3 * 40.078 + 5 * 137.327 + 3 * 63.546 + 3 * 140.116 + 2 * 238.02891 + 3 * 101.07 + 5 * 106.42 + 3 * 26.9815386 + 5 * 157.25 + 5 * 58.933195 + 2 * 238.0495599 + 3 * 232.03806 + 2 * 168.93421 + 5 * 55.845 + 3 * 121.76 + 3 * 78.96 + 8 * 32.065 =
7833.0511 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Al3Ba5Ca3Ce3Co5Cu3Fe5Gd5Hg3La2Pb2Pd5Pu2Ru3S8Sb3Se3Th3Tm2U2

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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