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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of U6Au2C6O9Po2H10Og10Pb8Ba3Al7Mg7Xe10Ca13Ni8He2S12K20Cl12 is 8798.4748 g/mol

Convert between U6Au2C6O9Po2H10Og10Pb8Ba3Al7Mg7Xe10Ca13Ni8He2S12K20Cl12 weight and moles
CompoundMolesWeight, g
U6Au2C6O9Po2H10Og10Pb8Ba3Al7Mg7Xe10Ca13Ni8He2S12K20Cl12

Elemental composition of U6Au2C6O9Po2H10Og10Pb8Ba3Al7Mg7Xe10Ca13Ni8He2S12K20Cl12
ElementSymbolAtomic weightAtomsMass percent
UraniumU238.02891616.2321
GoldAu196.96656924.4773
CarbonC12.010760.8191
OxygenO15.999491.6366
PoloniumPo208.98243024.7504
HydrogenH1.00794100.1146
OganessonOg0.0000000100.0000
LeadPb207.2818.8396
BariumBa137.32734.6824
AluminumAl26.981538672.1466
MagnesiumMg24.305071.9337
XenonXe131.2931014.9222
CalciumCa40.078135.9216
NickelNi58.693485.3367
HeliumHe4.00260220.0910
SulfurS32.065124.3733
PotassiumK39.0983208.8875
ChlorineCl35.453124.8353

Computing molar mass step by step

First, compute the number of each atom in U6Au2C6O9Po2H10Og10Pb8Ba3Al7Mg7Xe10Ca13Ni8He2S12K20Cl12:
U: 6, Au: 2, C: 6, O: 9, Po: 2, H: 10, Og: 10, Pb: 8, Ba: 3, Al: 7, Mg: 7, Xe: 10, Ca: 13, Ni: 8, He: 2, S: 12, K: 20, Cl: 12

Then, lookup atomic weights for each element in periodic table:
U: 238.02891, Au: 196.966569, C: 12.0107, O: 15.9994, Po: 208.9824304, H: 1.00794, Og: 0, Pb: 207.2, Ba: 137.327, Al: 26.9815386, Mg: 24.305, Xe: 131.293, Ca: 40.078, Ni: 58.6934, He: 4.002602, S: 32.065, K: 39.0983, Cl: 35.453

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (U6Au2C6O9Po2H10Og10Pb8Ba3Al7Mg7Xe10Ca13Ni8He2S12K20Cl12) = ∑ Counti * Weighti =
Count(U) * Weight(U) + Count(Au) * Weight(Au) + Count(C) * Weight(C) + Count(O) * Weight(O) + Count(Po) * Weight(Po) + Count(H) * Weight(H) + Count(Og) * Weight(Og) + Count(Pb) * Weight(Pb) + Count(Ba) * Weight(Ba) + Count(Al) * Weight(Al) + Count(Mg) * Weight(Mg) + Count(Xe) * Weight(Xe) + Count(Ca) * Weight(Ca) + Count(Ni) * Weight(Ni) + Count(He) * Weight(He) + Count(S) * Weight(S) + Count(K) * Weight(K) + Count(Cl) * Weight(Cl) =
6 * 238.02891 + 2 * 196.966569 + 6 * 12.0107 + 9 * 15.9994 + 2 * 208.9824304 + 10 * 1.00794 + 10 * 0 + 8 * 207.2 + 3 * 137.327 + 7 * 26.9815386 + 7 * 24.305 + 10 * 131.293 + 13 * 40.078 + 8 * 58.6934 + 2 * 4.002602 + 12 * 32.065 + 20 * 39.0983 + 12 * 35.453 =
8798.4748 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C6H10Al7Au2Ba3Ca13Cl12He2K20Mg7Ni8O9Og10Pb8Po2S12U6Xe10

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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