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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HOFeCrLiBeKCaScTiCPSeICoNiCuBrGaLaCePrNdPmSmHfTaWXeHe is 2430.4667 g/mol

Convert between HOFeCrLiBeKCaScTiCPSeICoNiCuBrGaLaCePrNdPmSmHfTaWXeHe weight and moles
CompoundMolesWeight, g
HOFeCrLiBeKCaScTiCPSeICoNiCuBrGaLaCePrNdPmSmHfTaWXeHe

Elemental composition of HOFeCrLiBeKCaScTiCPSeICoNiCuBrGaLaCePrNdPmSmHfTaWXeHe
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0415
OxygenO15.999410.6583
IronFe55.84512.2977
ChromiumCr51.996112.1393
LithiumLi6.94110.2856
BerylliumBe9.01218210.3708
PotassiumK39.098311.6087
CalciumCa40.07811.6490
ScandiumSc44.95591211.8497
TitaniumTi47.86711.9695
CarbonC12.010710.4942
PhosphorusP30.97376211.2744
SeleniumSe78.9613.2488
IodineI126.9044715.2214
CobaltCo58.93319512.4248
NickelNi58.693412.4149
CopperCu63.54612.6146
BromineBr79.90413.2876
GalliumGa69.72312.8687
LanthanumLa138.9054715.7152
CeriumCe140.11615.7650
PraseodymiumPr140.9076515.7976
NeodymiumNd144.24215.9347
PromethiumPm144.91274915.9623
SamariumSm150.3616.1865
HafniumHf178.4917.3439
TantalumTa180.9478817.4450
TungstenW183.8417.5640
XenonXe131.29315.4020
HeliumHe4.00260210.1647

Computing molar mass step by step

First, compute the number of each atom in HOFeCrLiBeKCaScTiCPSeICoNiCuBrGaLaCePrNdPmSmHfTaWXeHe:
H: 1, O: 1, Fe: 1, Cr: 1, Li: 1, Be: 1, K: 1, Ca: 1, Sc: 1, Ti: 1, C: 1, P: 1, Se: 1, I: 1, Co: 1, Ni: 1, Cu: 1, Br: 1, Ga: 1, La: 1, Ce: 1, Pr: 1, Nd: 1, Pm: 1, Sm: 1, Hf: 1, Ta: 1, W: 1, Xe: 1, He: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, O: 15.9994, Fe: 55.845, Cr: 51.9961, Li: 6.941, Be: 9.012182, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, C: 12.0107, P: 30.973762, Se: 78.96, I: 126.90447, Co: 58.933195, Ni: 58.6934, Cu: 63.546, Br: 79.904, Ga: 69.723, La: 138.90547, Ce: 140.116, Pr: 140.90765, Nd: 144.242, Pm: 144.912749, Sm: 150.36, Hf: 178.49, Ta: 180.94788, W: 183.84, Xe: 131.293, He: 4.002602

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HOFeCrLiBeKCaScTiCPSeICoNiCuBrGaLaCePrNdPmSmHfTaWXeHe) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(O) * Weight(O) + Count(Fe) * Weight(Fe) + Count(Cr) * Weight(Cr) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + Count(Ti) * Weight(Ti) + Count(C) * Weight(C) + Count(P) * Weight(P) + Count(Se) * Weight(Se) + Count(I) * Weight(I) + Count(Co) * Weight(Co) + Count(Ni) * Weight(Ni) + Count(Cu) * Weight(Cu) + Count(Br) * Weight(Br) + Count(Ga) * Weight(Ga) + Count(La) * Weight(La) + Count(Ce) * Weight(Ce) + Count(Pr) * Weight(Pr) + Count(Nd) * Weight(Nd) + Count(Pm) * Weight(Pm) + Count(Sm) * Weight(Sm) + Count(Hf) * Weight(Hf) + Count(Ta) * Weight(Ta) + Count(W) * Weight(W) + Count(Xe) * Weight(Xe) + Count(He) * Weight(He) =
1 * 1.00794 + 1 * 15.9994 + 1 * 55.845 + 1 * 51.9961 + 1 * 6.941 + 1 * 9.012182 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 12.0107 + 1 * 30.973762 + 1 * 78.96 + 1 * 126.90447 + 1 * 58.933195 + 1 * 58.6934 + 1 * 63.546 + 1 * 79.904 + 1 * 69.723 + 1 * 138.90547 + 1 * 140.116 + 1 * 140.90765 + 1 * 144.242 + 1 * 144.912749 + 1 * 150.36 + 1 * 178.49 + 1 * 180.94788 + 1 * 183.84 + 1 * 131.293 + 1 * 4.002602 =
2430.4667 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHBeBrCaCeCoCrCuFeGaHeHfIKLaLiNdNiOPPmPrScSeSmTaTiWXe

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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