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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Al8Pb4Ir3Au10Li6K4Na5C6H8N4O3I5P4S3Cl8F4Se8(C6H5)4(C2H5)3D6He8B4 is 6416.9681 g/mol

Convert between Al8Pb4Ir3Au10Li6K4Na5C6H8N4O3I5P4S3Cl8F4Se8(C6H5)4(C2H5)3D6He8B4 weight and moles
CompoundMolesWeight, g
Al8Pb4Ir3Au10Li6K4Na5C6H8N4O3I5P4S3Cl8F4Se8(C6H5)4(C2H5)3D6He8B4

Elemental composition of Al8Pb4Ir3Au10Li6K4Na5C6H8N4O3I5P4S3Cl8F4Se8(C6H5)4(C2H5)3D6He8B4
ElementSymbolAtomic weightAtomsMass percent
AluminumAl26.981538683.3638
LeadPb207.2412.9158
IridiumIr192.21738.9863
GoldAu196.9665691030.6946
LithiumLi6.94160.6490
PotassiumK39.098342.4372
SodiumNa22.9897692851.7913
CarbonC12.0107366.7382
HydrogenH1.00794430.6754
NitrogenN14.006740.8731
OxygenO15.999430.7480
IodineI126.9044759.8882
PhosphorusP30.97376241.9307
SulfurS32.06531.4991
ChlorineCl35.45384.4199
FluorineF18.998403241.1843
SeleniumSe78.9689.8439
HeliumHe4.00260280.4990
BoronB10.81140.6739
HydrogenD2.014101777860.1883

Computing molar mass step by step

First, compute the number of each atom in Al8Pb4Ir3Au10Li6K4Na5C6H8N4O3I5P4S3Cl8F4Se8(C6H5)4(C2H5)3D6He8B4:
Al: 8, Pb: 4, Ir: 3, Au: 10, Li: 6, K: 4, Na: 5, C: 36, H: 43, N: 4, O: 3, I: 5, P: 4, S: 3, Cl: 8, F: 4, Se: 8, He: 8, B: 4, D: 6

Then, lookup atomic weights for each element in periodic table:
Al: 26.9815386, Pb: 207.2, Ir: 192.217, Au: 196.966569, Li: 6.941, K: 39.0983, Na: 22.98976928, C: 12.0107, H: 1.00794, N: 14.0067, O: 15.9994, I: 126.90447, P: 30.973762, S: 32.065, Cl: 35.453, F: 18.9984032, Se: 78.96, He: 4.002602, B: 10.811, D: 2.0141017778

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (Al8Pb4Ir3Au10Li6K4Na5C6H8N4O3I5P4S3Cl8F4Se8(C6H5)4(C2H5)3D6He8B4) = ∑ Counti * Weighti =
Count(Al) * Weight(Al) + Count(Pb) * Weight(Pb) + Count(Ir) * Weight(Ir) + Count(Au) * Weight(Au) + Count(Li) * Weight(Li) + Count(K) * Weight(K) + Count(Na) * Weight(Na) + Count(C) * Weight(C) + Count(H) * Weight(H) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(I) * Weight(I) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(F) * Weight(F) + Count(Se) * Weight(Se) + Count(He) * Weight(He) + Count(B) * Weight(B) + Count(D) * Weight(D) =
8 * 26.9815386 + 4 * 207.2 + 3 * 192.217 + 10 * 196.966569 + 6 * 6.941 + 4 * 39.0983 + 5 * 22.98976928 + 36 * 12.0107 + 43 * 1.00794 + 4 * 14.0067 + 3 * 15.9994 + 5 * 126.90447 + 4 * 30.973762 + 3 * 32.065 + 8 * 35.453 + 4 * 18.9984032 + 8 * 78.96 + 8 * 4.002602 + 4 * 10.811 + 6 * 2.0141017778 =
6416.9681 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C36H43Al8Au10B4Cl8F4D6He8I5Ir3K4Li6N4Na5O3P4Pb4S3Se8

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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