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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of O58PbZn3Mg7Si5Na6BaP4Ca3Al4B4GeK2Li10F4 is 2608.6727 g/mol

Convert between O58PbZn3Mg7Si5Na6BaP4Ca3Al4B4GeK2Li10F4 weight and moles
CompoundMolesWeight, g
O58PbZn3Mg7Si5Na6BaP4Ca3Al4B4GeK2Li10F4

Elemental composition of O58PbZn3Mg7Si5Na6BaP4Ca3Al4B4GeK2Li10F4
ElementSymbolAtomic weightAtomsMass percent
OxygenO15.99945835.5723
LeadPb207.217.9427
ZincZn65.3837.5188
MagnesiumMg24.305076.5219
SiliconSi28.085555.3831
SodiumNa22.9897692865.2877
BariumBa137.32715.2642
PhosphorusP30.97376244.7494
CalciumCa40.07834.6090
AluminumAl26.981538644.1372
BoronB10.81141.6577
GermaniumGe72.6412.7846
PotassiumK39.098322.9976
LithiumLi6.941102.6607
FluorineF18.998403242.9131

Computing molar mass step by step

First, compute the number of each atom in O58PbZn3Mg7Si5Na6BaP4Ca3Al4B4GeK2Li10F4:
O: 58, Pb: 1, Zn: 3, Mg: 7, Si: 5, Na: 6, Ba: 1, P: 4, Ca: 3, Al: 4, B: 4, Ge: 1, K: 2, Li: 10, F: 4

Then, lookup atomic weights for each element in periodic table:
O: 15.9994, Pb: 207.2, Zn: 65.38, Mg: 24.305, Si: 28.0855, Na: 22.98976928, Ba: 137.327, P: 30.973762, Ca: 40.078, Al: 26.9815386, B: 10.811, Ge: 72.64, K: 39.0983, Li: 6.941, F: 18.9984032

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (O58PbZn3Mg7Si5Na6BaP4Ca3Al4B4GeK2Li10F4) = ∑ Counti * Weighti =
Count(O) * Weight(O) + Count(Pb) * Weight(Pb) + Count(Zn) * Weight(Zn) + Count(Mg) * Weight(Mg) + Count(Si) * Weight(Si) + Count(Na) * Weight(Na) + Count(Ba) * Weight(Ba) + Count(P) * Weight(P) + Count(Ca) * Weight(Ca) + Count(Al) * Weight(Al) + Count(B) * Weight(B) + Count(Ge) * Weight(Ge) + Count(K) * Weight(K) + Count(Li) * Weight(Li) + Count(F) * Weight(F) =
58 * 15.9994 + 1 * 207.2 + 3 * 65.38 + 7 * 24.305 + 5 * 28.0855 + 6 * 22.98976928 + 1 * 137.327 + 4 * 30.973762 + 3 * 40.078 + 4 * 26.9815386 + 4 * 10.811 + 1 * 72.64 + 2 * 39.0983 + 10 * 6.941 + 4 * 18.9984032 =
2608.6727 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Al4B4BaCa3F4GeK2Li10Mg7Na6O58P4PbSi5Zn3

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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