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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of CoPt999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm is 201441.2946 g/mol

Convert between CoPt999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm weight and moles
CompoundMolesWeight, g
CoPt999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm

Elemental composition of CoPt999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm
ElementSymbolAtomic weightAtomsMass percent
CobaltCo58.93319510.0293
PlatinumPt195.08499996.7473
ManganeseMn54.93804510.0273
TungstenW183.8420.1825
RutherfordiumRf265.116710.1316
GoldAu196.96656910.0978
MeitneriumMt276.151210.1371
IronFe55.84510.0277
NiobiumNb92.9063820.0922
TitaniumTi47.86710.0238
ScandiumSc44.95591210.0223
FranciumFr223.01973610.1107
SamariumSm150.3610.0746
EuropiumEu151.96410.0754
GadoliniumGd157.2510.0781
LawrenciumLr262.109610.1301
NobeliumNo259.101010.1286
TelluriumTe127.6010.0633
AntimonySb121.76010.0604
SulfurS32.06540.0637
MolybdenumMo95.9610.0476
DysprosiumDy162.50060.4840
HolmiumHo164.9303240.3275
ErbiumEr167.25970.5812
MendeleviumMd258.09843110.1281
FermiumFm257.09510510.1276

Computing molar mass step by step

First, compute the number of each atom in CoPt999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm:
Co: 1, Pt: 999, 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:
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 (CoPt999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm) = ∑ Counti * Weighti =
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 * 58.933195 + 999 * 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 =
201441.2946 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AuCoDy6Er7EuFeFmFrGdHo4LrMdMnMoMtNb2NoPt999RfS4SbScSmTeTiW2

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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