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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H2Li3Na4K5Rb6Cs7Fr8Mt9Be20Mg18Ca16Sr14Ba12Ra10 is 12416.7925 g/mol

Convert between H2Li3Na4K5Rb6Cs7Fr8Mt9Be20Mg18Ca16Sr14Ba12Ra10 weight and moles
CompoundMolesWeight, g
H2Li3Na4K5Rb6Cs7Fr8Mt9Be20Mg18Ca16Sr14Ba12Ra10

Elemental composition of H2Li3Na4K5Rb6Cs7Fr8Mt9Be20Mg18Ca16Sr14Ba12Ra10
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079420.0162
LithiumLi6.94130.1677
SodiumNa22.9897692840.7406
PotassiumK39.098351.5744
RubidiumRb85.467864.1299
CesiumCs132.905451977.4926
FranciumFr223.019736814.3689
MeitneriumMt276.1512920.0161
BerylliumBe9.012182201.4516
MagnesiumMg24.3050183.5234
CalciumCa40.078165.1644
StrontiumSr87.62149.8792
BariumBa137.3271213.2717
RadiumRa226.0254101018.2032

Computing molar mass step by step

First, compute the number of each atom in H2Li3Na4K5Rb6Cs7Fr8Mt9Be20Mg18Ca16Sr14Ba12Ra10:
H: 2, Li: 3, Na: 4, K: 5, Rb: 6, Cs: 7, Fr: 8, Mt: 9, Be: 20, Mg: 18, Ca: 16, Sr: 14, Ba: 12, Ra: 10

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Li: 6.941, Na: 22.98976928, K: 39.0983, Rb: 85.4678, Cs: 132.9054519, Fr: 223.0197359, Mt: 276.15116, Be: 9.012182, Mg: 24.305, Ca: 40.078, Sr: 87.62, Ba: 137.327, Ra: 226.0254098

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (H2Li3Na4K5Rb6Cs7Fr8Mt9Be20Mg18Ca16Sr14Ba12Ra10) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(Li) * Weight(Li) + Count(Na) * Weight(Na) + Count(K) * Weight(K) + Count(Rb) * Weight(Rb) + Count(Cs) * Weight(Cs) + Count(Fr) * Weight(Fr) + Count(Mt) * Weight(Mt) + Count(Be) * Weight(Be) + Count(Mg) * Weight(Mg) + Count(Ca) * Weight(Ca) + Count(Sr) * Weight(Sr) + Count(Ba) * Weight(Ba) + Count(Ra) * Weight(Ra) =
2 * 1.00794 + 3 * 6.941 + 4 * 22.98976928 + 5 * 39.0983 + 6 * 85.4678 + 7 * 132.9054519 + 8 * 223.0197359 + 9 * 276.15116 + 20 * 9.012182 + 18 * 24.305 + 16 * 40.078 + 14 * 87.62 + 12 * 137.327 + 10 * 226.0254098 =
12416.7925 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Ba12Be20Ca16Cs7Fr8H2K5Li3Mg18Mt9Na4Ra10Rb6Sr14

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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