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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H9He9Li9Be9B9C9N9O9F9Ne9Na9Mg9Al9SI9P9S9Cl9Ar9K9Ca9SC9Ti9V9 is 5847.4010 g/mol

Convert between H9He9Li9Be9B9C9N9O9F9Ne9Na9Mg9Al9SI9P9S9Cl9Ar9K9Ca9SC9Ti9V9 weight and moles
CompoundMolesWeight, g
H9He9Li9Be9B9C9N9O9F9Ne9Na9Mg9Al9SI9P9S9Cl9Ar9K9Ca9SC9Ti9V9

Elemental composition of H9He9Li9Be9B9C9N9O9F9Ne9Na9Mg9Al9SI9P9S9Cl9Ar9K9Ca9SC9Ti9V9
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079490.1551
HeliumHe4.00260290.6161
LithiumLi6.94191.0683
BerylliumBe9.01218291.3871
BoronB10.81191.6640
CarbonC12.0107183.6972
NitrogenN14.006792.1558
OxygenO15.999492.4625
FluorineF18.998403292.9241
NeonNe20.179793.1059
SodiumNa22.9897692893.5385
MagnesiumMg24.305093.7409
AluminumAl26.981538694.1529
SulfurS32.065116.0320
IodineI126.90447919.5324
PhosphorusP30.97376294.7673
ChlorineCl35.45395.4567
ArgonAr39.94896.1486
PotassiumK39.098396.0178
CalciumCa40.07896.1686
TitaniumTi47.86797.3674
VanadiumV50.941597.8406

Computing molar mass step by step

First, compute the number of each atom in H9He9Li9Be9B9C9N9O9F9Ne9Na9Mg9Al9SI9P9S9Cl9Ar9K9Ca9SC9Ti9V9:
H: 9, He: 9, Li: 9, Be: 9, B: 9, C: 18, N: 9, O: 9, F: 9, Ne: 9, Na: 9, Mg: 9, Al: 9, S: 11, I: 9, P: 9, Cl: 9, Ar: 9, K: 9, Ca: 9, Ti: 9, V: 9

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, S: 32.065, I: 126.90447, P: 30.973762, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078, Ti: 47.867, V: 50.9415

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (H9He9Li9Be9B9C9N9O9F9Ne9Na9Mg9Al9SI9P9S9Cl9Ar9K9Ca9SC9Ti9V9) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(S) * Weight(S) + Count(I) * Weight(I) + Count(P) * Weight(P) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Ti) * Weight(Ti) + Count(V) * Weight(V) =
9 * 1.00794 + 9 * 4.002602 + 9 * 6.941 + 9 * 9.012182 + 9 * 10.811 + 18 * 12.0107 + 9 * 14.0067 + 9 * 15.9994 + 9 * 18.9984032 + 9 * 20.1797 + 9 * 22.98976928 + 9 * 24.305 + 9 * 26.9815386 + 11 * 32.065 + 9 * 126.90447 + 9 * 30.973762 + 9 * 35.453 + 9 * 39.948 + 9 * 39.0983 + 9 * 40.078 + 9 * 47.867 + 9 * 50.9415 =
5847.4010 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C18H9Al9Ar9B9Be9Ca9Cl9F9He9I9K9Li9Mg9N9Na9Ne9O9P9S11Ti9V9

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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