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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Eu3Sm7Li5Cs4Rb6K4Ra6Ba7Sr8Ca9Na1Ac6La5Ce4P2 is 8825.1374 g/mol

Convert between Eu3Sm7Li5Cs4Rb6K4Ra6Ba7Sr8Ca9Na1Ac6La5Ce4P2 weight and moles
CompoundMolesWeight, g
Eu3Sm7Li5Cs4Rb6K4Ra6Ba7Sr8Ca9Na1Ac6La5Ce4P2

Elemental composition of Eu3Sm7Li5Cs4Rb6K4Ra6Ba7Sr8Ca9Na1Ac6La5Ce4P2
ElementSymbolAtomic weightAtomsMass percent
EuropiumEu151.96435.1658
SamariumSm150.36711.9264
LithiumLi6.94150.3933
CesiumCs132.905451946.0239
RubidiumRb85.467865.8108
PotassiumK39.098341.7721
RadiumRa226.025410615.3669
BariumBa137.327710.8926
StrontiumSr87.6287.9428
CalciumCa40.07894.0872
SodiumNa22.9897692810.2605
ActiniumAc227.027752615.4351
LanthanumLa138.9054757.8699
CeriumCe140.11646.3508
PhosphorusP30.97376220.7019

Computing molar mass step by step

First, compute the number of each atom in Eu3Sm7Li5Cs4Rb6K4Ra6Ba7Sr8Ca9Na1Ac6La5Ce4P2:
Eu: 3, Sm: 7, Li: 5, Cs: 4, Rb: 6, K: 4, Ra: 6, Ba: 7, Sr: 8, Ca: 9, Na: 1, Ac: 6, La: 5, Ce: 4, P: 2

Then, lookup atomic weights for each element in periodic table:
Eu: 151.964, Sm: 150.36, Li: 6.941, Cs: 132.9054519, Rb: 85.4678, K: 39.0983, Ra: 226.0254098, Ba: 137.327, Sr: 87.62, Ca: 40.078, Na: 22.98976928, Ac: 227.0277521, La: 138.90547, Ce: 140.116, P: 30.973762

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (Eu3Sm7Li5Cs4Rb6K4Ra6Ba7Sr8Ca9Na1Ac6La5Ce4P2) = ∑ Counti * Weighti =
Count(Eu) * Weight(Eu) + Count(Sm) * Weight(Sm) + Count(Li) * Weight(Li) + Count(Cs) * Weight(Cs) + Count(Rb) * Weight(Rb) + Count(K) * Weight(K) + Count(Ra) * Weight(Ra) + Count(Ba) * Weight(Ba) + Count(Sr) * Weight(Sr) + Count(Ca) * Weight(Ca) + Count(Na) * Weight(Na) + Count(Ac) * Weight(Ac) + Count(La) * Weight(La) + Count(Ce) * Weight(Ce) + Count(P) * Weight(P) =
3 * 151.964 + 7 * 150.36 + 5 * 6.941 + 4 * 132.9054519 + 6 * 85.4678 + 4 * 39.0983 + 6 * 226.0254098 + 7 * 137.327 + 8 * 87.62 + 9 * 40.078 + 1 * 22.98976928 + 6 * 227.0277521 + 5 * 138.90547 + 4 * 140.116 + 2 * 30.973762 =
8825.1374 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Ac6Ba7Ca9Ce4Cs4Eu3K4La5Li5NaP2Ra6Rb6Sm7Sr8

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

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