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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of SiCoPt99MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm is 25893.7801 g/mol

Convert between SiCoPt99MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm weight and moles
CompoundMolesWeight, g
SiCoPt99MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm

Elemental composition of SiCoPt99MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm
ElementSymbolAtomic weightAtomsMass percent
SiliconSi28.085510.1085
CobaltCo58.93319510.2276
PlatinumPt195.0849974.5867
ManganeseMn54.93804510.2122
TungstenW183.8421.4200
RutherfordiumRf265.116711.0239
GoldAu196.96656910.7607
MeitneriumMt276.151211.0665
IronFe55.84510.2157
NiobiumNb92.9063820.7176
TitaniumTi47.86710.1849
ScandiumSc44.95591210.1736
FranciumFr223.01973610.8613
SamariumSm150.3610.5807
EuropiumEu151.96410.5869
GadoliniumGd157.2510.6073
LawrenciumLr262.109611.0122
NobeliumNo259.101011.0006
TelluriumTe127.6010.4928
AntimonySb121.76010.4702
SulfurS32.06540.4953
MolybdenumMo95.9610.3706
DysprosiumDy162.50063.7654
HolmiumHo164.9303242.5478
ErbiumEr167.25974.5216
MendeleviumMd258.09843110.9968
FermiumFm257.09510510.9929

Computing molar mass step by step

First, compute the number of each atom in SiCoPt99MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm:
Si: 1, Co: 1, Pt: 99, Mn: 1, W: 2, Rf: 1, Au: 1, Mt: 1, Fe: 1, Nb: 2, Ti: 1, Sc: 1, Fr: 1, Sm: 1, Eu: 1, Gd: 1, Lr: 1, No: 1, Te: 1, Sb: 1, S: 4, Mo: 1, Dy: 6, Ho: 4, Er: 7, Md: 1, Fm: 1

Then, lookup atomic weights for each element in periodic table:
Si: 28.0855, Co: 58.933195, Pt: 195.084, Mn: 54.938045, W: 183.84, Rf: 265.1167, Au: 196.966569, Mt: 276.15116, Fe: 55.845, Nb: 92.90638, Ti: 47.867, Sc: 44.955912, Fr: 223.0197359, Sm: 150.36, Eu: 151.964, Gd: 157.25, Lr: 262.10963, No: 259.10103, Te: 127.6, Sb: 121.76, S: 32.065, Mo: 95.96, Dy: 162.5, Ho: 164.93032, Er: 167.259, Md: 258.098431, Fm: 257.095105

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (SiCoPt99MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm) = ∑ Counti * Weighti =
Count(Si) * Weight(Si) + Count(Co) * Weight(Co) + Count(Pt) * Weight(Pt) + Count(Mn) * Weight(Mn) + Count(W) * Weight(W) + Count(Rf) * Weight(Rf) + Count(Au) * Weight(Au) + Count(Mt) * Weight(Mt) + Count(Fe) * Weight(Fe) + Count(Nb) * Weight(Nb) + Count(Ti) * Weight(Ti) + Count(Sc) * Weight(Sc) + Count(Fr) * Weight(Fr) + Count(Sm) * Weight(Sm) + Count(Eu) * Weight(Eu) + Count(Gd) * Weight(Gd) + Count(Lr) * Weight(Lr) + Count(No) * Weight(No) + Count(Te) * Weight(Te) + Count(Sb) * Weight(Sb) + Count(S) * Weight(S) + Count(Mo) * Weight(Mo) + Count(Dy) * Weight(Dy) + Count(Ho) * Weight(Ho) + Count(Er) * Weight(Er) + Count(Md) * Weight(Md) + Count(Fm) * Weight(Fm) =
1 * 28.0855 + 1 * 58.933195 + 99 * 195.084 + 1 * 54.938045 + 2 * 183.84 + 1 * 265.1167 + 1 * 196.966569 + 1 * 276.15116 + 1 * 55.845 + 2 * 92.90638 + 1 * 47.867 + 1 * 44.955912 + 1 * 223.0197359 + 1 * 150.36 + 1 * 151.964 + 1 * 157.25 + 1 * 262.10963 + 1 * 259.10103 + 1 * 127.6 + 1 * 121.76 + 4 * 32.065 + 1 * 95.96 + 6 * 162.5 + 4 * 164.93032 + 7 * 167.259 + 1 * 258.098431 + 1 * 257.095105 =
25893.7801 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AuCoDy6Er7EuFeFmFrGdHo4LrMdMnMoMtNb2NoPt99RfS4SbScSiSmTeTiW2

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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