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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of CoPt9999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm is 1957197.2946 g/mol

Convert between CoPt9999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm weight and moles
CompoundMolesWeight, g
CoPt9999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm

Elemental composition of CoPt9999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm
ElementSymbolAtomic weightAtomsMass percent
CobaltCo58.93319510.0030
PlatinumPt195.084999999.6652
ManganeseMn54.93804510.0028
TungstenW183.8420.0188
RutherfordiumRf265.116710.0135
GoldAu196.96656910.0101
MeitneriumMt276.151210.0141
IronFe55.84510.0029
NiobiumNb92.9063820.0095
TitaniumTi47.86710.0024
ScandiumSc44.95591210.0023
FranciumFr223.01973610.0114
SamariumSm150.3610.0077
EuropiumEu151.96410.0078
GadoliniumGd157.2510.0080
LawrenciumLr262.109610.0134
NobeliumNo259.101010.0132
TelluriumTe127.6010.0065
AntimonySb121.76010.0062
SulfurS32.06540.0066
MolybdenumMo95.9610.0049
DysprosiumDy162.50060.0498
HolmiumHo164.9303240.0337
ErbiumEr167.25970.0598
MendeleviumMd258.09843110.0132
FermiumFm257.09510510.0131

Computing molar mass step by step

First, compute the number of each atom in CoPt9999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm:
Co: 1, Pt: 9999, 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 (CoPt9999MnW2RfAuMtFeNb2TiScFrSmEuGdLrNoTeSbS4MoDy6Ho4Er7MdFm) = ∑ 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 + 9999 * 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 =
1957197.2946 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AuCoDy6Er7EuFeFmFrGdHo4LrMdMnMoMtNb2NoPt9999RfS4SbScSmTeTiW2

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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