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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCo is 1764.8401 g/mol

Convert between AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCo weight and moles
CompoundMolesWeight, g
AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCo

Elemental composition of AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCo
ElementSymbolAtomic weightAtomsMass percent
AluminumAl26.981538611.5288
SiliconSi28.085511.5914
BoronB10.81110.6126
CopperCu63.54613.6007
NickelNi58.693413.3257
HydrogenH1.0079410.0571
HeliumHe4.00260210.2268
MolybdenumMo95.9615.4373
UraniumU238.02891113.4873
PlutoniumPu238.049560113.4884
BohriumBh272.1380115.4200
LithiumLi6.94110.3933
BerylliumBe9.01218210.5107
CarbonC12.010710.6806
NitrogenN14.006710.7937
OxygenO15.999410.9066
PhosphorusP30.97376211.7550
SulfurS32.06511.8169
FluorineF18.998403211.0765
NeonNe20.179711.1434
ChlorineCl35.45312.0089
ArgonAr39.94812.2635
SodiumNa22.9897692811.3027
MagnesiumMg24.305011.3772
PotassiumK39.098312.2154
CalciumCa40.07812.2709
ScandiumSc44.95591212.5473
TitaniumTi47.86712.7123
VanadiumV50.941512.8865
ChromiumCr51.996112.9462
ManganeseMn54.93804513.1129
IronFe55.84513.1643
CobaltCo58.93319513.3393

Computing molar mass step by step

First, compute the number of each atom in AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCo:
Al: 1, Si: 1, B: 1, Cu: 1, Ni: 1, H: 1, He: 1, Mo: 1, U: 1, Pu: 1, Bh: 1, Li: 1, Be: 1, C: 1, N: 1, O: 1, P: 1, S: 1, F: 1, Ne: 1, Cl: 1, Ar: 1, Na: 1, Mg: 1, K: 1, Ca: 1, Sc: 1, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1

Then, lookup atomic weights for each element in periodic table:
Al: 26.9815386, Si: 28.0855, B: 10.811, Cu: 63.546, Ni: 58.6934, H: 1.00794, He: 4.002602, Mo: 95.96, U: 238.02891, Pu: 238.0495599, Bh: 272.13803, Li: 6.941, Be: 9.012182, C: 12.0107, N: 14.0067, O: 15.9994, P: 30.973762, S: 32.065, F: 18.9984032, Ne: 20.1797, Cl: 35.453, Ar: 39.948, Na: 22.98976928, Mg: 24.305, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Cr: 51.9961, Mn: 54.938045, Fe: 55.845, Co: 58.933195

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (AlSiBCuNiHHeMoUPuBhLiBeCNOPSFNeClArNaMgKCaScTiVCrMnFeCo) = ∑ Counti * Weighti =
Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(B) * Weight(B) + Count(Cu) * Weight(Cu) + Count(Ni) * Weight(Ni) + Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Mo) * Weight(Mo) + Count(U) * Weight(U) + Count(Pu) * Weight(Pu) + Count(Bh) * Weight(Bh) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + Count(Ti) * Weight(Ti) + Count(V) * Weight(V) + Count(Cr) * Weight(Cr) + Count(Mn) * Weight(Mn) + Count(Fe) * Weight(Fe) + Count(Co) * Weight(Co) =
1 * 26.9815386 + 1 * 28.0855 + 1 * 10.811 + 1 * 63.546 + 1 * 58.6934 + 1 * 1.00794 + 1 * 4.002602 + 1 * 95.96 + 1 * 238.02891 + 1 * 238.0495599 + 1 * 272.13803 + 1 * 6.941 + 1 * 9.012182 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 30.973762 + 1 * 32.065 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 35.453 + 1 * 39.948 + 1 * 22.98976928 + 1 * 24.305 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 50.9415 + 1 * 51.9961 + 1 * 54.938045 + 1 * 55.845 + 1 * 58.933195 =
1764.8401 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArBBeBhCaClCoCrCuFFeHeKLiMgMnMoNNaNeNiOPPuSScSiTiUV

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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