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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of KHHeLiBeBCNOFNeAlSiPSClArKXeBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK is 1524.3871 g/mol

Convert between KHHeLiBeBCNOFNeAlSiPSClArKXeBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK weight and moles
CompoundMolesWeight, g
KHHeLiBeBCNOFNeAlSiPSClArKXeBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK

Elemental composition of KHHeLiBeBCNOFNeAlSiPSClArKXeBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK
ElementSymbolAtomic weightAtomsMass percent
PotassiumK39.098337.6946
HydrogenH1.0079410.0661
HeliumHe4.00260210.2626
LithiumLi6.94110.4553
BerylliumBe9.01218210.5912
BoronB10.81110.7092
CarbonC12.010710.7879
NitrogenN14.006710.9188
OxygenO15.999411.0496
FluorineF18.998403211.2463
NeonNe20.179711.3238
AluminumAl26.981538611.7700
SiliconSi28.085511.8424
PhosphorusP30.97376212.0319
SulfurS32.06512.1035
ChlorineCl35.45312.3257
ArgonAr39.94812.6206
XenonXe131.29318.6128
BromineBr79.90415.2417
SeleniumSe78.9615.1798
ArsenicAs74.9216014.9149
GermaniumGe72.6414.7652
GalliumGa69.72314.5738
ZincZn65.3814.2889
CopperCu63.54614.1686
NickelNi58.693413.8503
CobaltCo58.93319513.8660
IronFe55.84513.6634
ManganeseMn54.93804513.6039
ChromiumCr51.996113.4110
VanadiumV50.941513.3418
TitaniumTi47.86713.1401
ScandiumSc44.95591212.9491
CalciumCa40.07812.6291

Computing molar mass step by step

First, compute the number of each atom in KHHeLiBeBCNOFNeAlSiPSClArKXeBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK:
K: 3, H: 1, He: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Al: 1, Si: 1, P: 1, S: 1, Cl: 1, Ar: 1, Xe: 1, Br: 1, Se: 1, As: 1, Ge: 1, Ga: 1, Zn: 1, Cu: 1, Ni: 1, Co: 1, Fe: 1, Mn: 1, Cr: 1, V: 1, Ti: 1, Sc: 1, Ca: 1

Then, lookup atomic weights for each element in periodic table:
K: 39.0983, 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, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, Ar: 39.948, Xe: 131.293, Br: 79.904, Se: 78.96, As: 74.9216, Ge: 72.64, Ga: 69.723, Zn: 65.38, Cu: 63.546, Ni: 58.6934, Co: 58.933195, Fe: 55.845, Mn: 54.938045, Cr: 51.9961, V: 50.9415, Ti: 47.867, Sc: 44.955912, Ca: 40.078

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (KHHeLiBeBCNOFNeAlSiPSClArKXeBrSeAsGeGaZnCuNiCoFeMnCrVTiScCaK) = ∑ Counti * Weighti =
Count(K) * Weight(K) + 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(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(Xe) * Weight(Xe) + Count(Br) * Weight(Br) + Count(Se) * Weight(Se) + Count(As) * Weight(As) + Count(Ge) * Weight(Ge) + Count(Ga) * Weight(Ga) + Count(Zn) * Weight(Zn) + Count(Cu) * Weight(Cu) + Count(Ni) * Weight(Ni) + Count(Co) * Weight(Co) + Count(Fe) * Weight(Fe) + Count(Mn) * Weight(Mn) + Count(Cr) * Weight(Cr) + Count(V) * Weight(V) + Count(Ti) * Weight(Ti) + Count(Sc) * Weight(Sc) + Count(Ca) * Weight(Ca) =
3 * 39.0983 + 1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 1 * 39.948 + 1 * 131.293 + 1 * 79.904 + 1 * 78.96 + 1 * 74.9216 + 1 * 72.64 + 1 * 69.723 + 1 * 65.38 + 1 * 63.546 + 1 * 58.6934 + 1 * 58.933195 + 1 * 55.845 + 1 * 54.938045 + 1 * 51.9961 + 1 * 50.9415 + 1 * 47.867 + 1 * 44.955912 + 1 * 40.078 =
1524.3871 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeBrCaClCoCrCuFFeGaGeHeK3LiMnNNeNiOPSScSeSiTiVXeZn

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, 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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