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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of FeCSiMgCeMnNiPCrSXeKrTiAuAgNeHONHgPuUIPtNaKWCaZnMoNbSnPbGePd is 3151.8944 g/mol

Convert between FeCSiMgCeMnNiPCrSXeKrTiAuAgNeHONHgPuUIPtNaKWCaZnMoNbSnPbGePd weight and moles
CompoundMolesWeight, g
FeCSiMgCeMnNiPCrSXeKrTiAuAgNeHONHgPuUIPtNaKWCaZnMoNbSnPbGePd

Elemental composition of FeCSiMgCeMnNiPCrSXeKrTiAuAgNeHONHgPuUIPtNaKWCaZnMoNbSnPbGePd
ElementSymbolAtomic weightAtomsMass percent
IronFe55.84511.7718
CarbonC12.010710.3811
SiliconSi28.085510.8911
MagnesiumMg24.305010.7711
CeriumCe140.11614.4455
ManganeseMn54.93804511.7430
NickelNi58.693411.8622
PhosphorusP30.97376210.9827
ChromiumCr51.996111.6497
SulfurS32.06511.0173
XenonXe131.29314.1655
KryptonKr83.79812.6587
TitaniumTi47.86711.5187
GoldAu196.96656916.2491
SilverAg107.868213.4223
NeonNe20.179710.6402
HydrogenH1.0079410.0320
OxygenO15.999410.5076
NitrogenN14.006710.4444
MercuryHg200.5916.3641
PlutoniumPu238.04956017.5526
UraniumU238.0289117.5519
IodineI126.9044714.0263
PlatinumPt195.08416.1894
SodiumNa22.9897692810.7294
PotassiumK39.098311.2405
TungstenW183.8415.8327
CalciumCa40.07811.2716
ZincZn65.3812.0743
MolybdenumMo95.9613.0445
NiobiumNb92.9063812.9476
TinSn118.71013.7663
LeadPb207.216.5738
GermaniumGe72.6412.3046
PalladiumPd106.4213.3764

Computing molar mass step by step

First, compute the number of each atom in FeCSiMgCeMnNiPCrSXeKrTiAuAgNeHONHgPuUIPtNaKWCaZnMoNbSnPbGePd:
Fe: 1, C: 1, Si: 1, Mg: 1, Ce: 1, Mn: 1, Ni: 1, P: 1, Cr: 1, S: 1, Xe: 1, Kr: 1, Ti: 1, Au: 1, Ag: 1, Ne: 1, H: 1, O: 1, N: 1, Hg: 1, Pu: 1, U: 1, I: 1, Pt: 1, Na: 1, K: 1, W: 1, Ca: 1, Zn: 1, Mo: 1, Nb: 1, Sn: 1, Pb: 1, Ge: 1, Pd: 1

Then, lookup atomic weights for each element in periodic table:
Fe: 55.845, C: 12.0107, Si: 28.0855, Mg: 24.305, Ce: 140.116, Mn: 54.938045, Ni: 58.6934, P: 30.973762, Cr: 51.9961, S: 32.065, Xe: 131.293, Kr: 83.798, Ti: 47.867, Au: 196.966569, Ag: 107.8682, Ne: 20.1797, H: 1.00794, O: 15.9994, N: 14.0067, Hg: 200.59, Pu: 238.0495599, U: 238.02891, I: 126.90447, Pt: 195.084, Na: 22.98976928, K: 39.0983, W: 183.84, Ca: 40.078, Zn: 65.38, Mo: 95.96, Nb: 92.90638, Sn: 118.71, Pb: 207.2, Ge: 72.64, Pd: 106.42

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (FeCSiMgCeMnNiPCrSXeKrTiAuAgNeHONHgPuUIPtNaKWCaZnMoNbSnPbGePd) = ∑ Counti * Weighti =
Count(Fe) * Weight(Fe) + Count(C) * Weight(C) + Count(Si) * Weight(Si) + Count(Mg) * Weight(Mg) + Count(Ce) * Weight(Ce) + Count(Mn) * Weight(Mn) + Count(Ni) * Weight(Ni) + Count(P) * Weight(P) + Count(Cr) * Weight(Cr) + Count(S) * Weight(S) + Count(Xe) * Weight(Xe) + Count(Kr) * Weight(Kr) + Count(Ti) * Weight(Ti) + Count(Au) * Weight(Au) + Count(Ag) * Weight(Ag) + Count(Ne) * Weight(Ne) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(N) * Weight(N) + Count(Hg) * Weight(Hg) + Count(Pu) * Weight(Pu) + Count(U) * Weight(U) + Count(I) * Weight(I) + Count(Pt) * Weight(Pt) + Count(Na) * Weight(Na) + Count(K) * Weight(K) + Count(W) * Weight(W) + Count(Ca) * Weight(Ca) + Count(Zn) * Weight(Zn) + Count(Mo) * Weight(Mo) + Count(Nb) * Weight(Nb) + Count(Sn) * Weight(Sn) + Count(Pb) * Weight(Pb) + Count(Ge) * Weight(Ge) + Count(Pd) * Weight(Pd) =
1 * 55.845 + 1 * 12.0107 + 1 * 28.0855 + 1 * 24.305 + 1 * 140.116 + 1 * 54.938045 + 1 * 58.6934 + 1 * 30.973762 + 1 * 51.9961 + 1 * 32.065 + 1 * 131.293 + 1 * 83.798 + 1 * 47.867 + 1 * 196.966569 + 1 * 107.8682 + 1 * 20.1797 + 1 * 1.00794 + 1 * 15.9994 + 1 * 14.0067 + 1 * 200.59 + 1 * 238.0495599 + 1 * 238.02891 + 1 * 126.90447 + 1 * 195.084 + 1 * 22.98976928 + 1 * 39.0983 + 1 * 183.84 + 1 * 40.078 + 1 * 65.38 + 1 * 95.96 + 1 * 92.90638 + 1 * 118.71 + 1 * 207.2 + 1 * 72.64 + 1 * 106.42 =
3151.8944 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAuCaCeCrFeGeHgIKKrMgMnMoNNaNbNeNiOPPbPdPtPuSSiSnTiUWXeZn

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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