Printed from https://www.webqc.org

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of PBBIPOAtRnFlMcTsErTmYBLuFmMdNOLr is 2935.2246 g/mol

Convert between PBBIPOAtRnFlMcTsErTmYBLuFmMdNOLr weight and moles
CompoundMolesWeight, g
PBBIPOAtRnFlMcTsErTmYBLuFmMdNOLr

Elemental composition of PBBIPOAtRnFlMcTsErTmYBLuFmMdNOLr
ElementSymbolAtomic weightAtomsMass percent
PhosphorusP30.97376222.1105
BoronB10.81131.1050
IodineI126.9044714.3235
OxygenO15.999421.0902
AstatineAt209.98714817.1540
RadonRn210.99060117.1882
FleroviumFl289.187319.8523
MoscoviumMc288.192519.8184
TennessineTs292.20819.9552
ErbiumEr167.25915.6983
ThuliumTm168.9342115.7554
YttriumY88.9058513.0289
LutetiumLu174.966815.9609
FermiumFm257.09510518.7590
MendeleviumMd258.09843118.7931
NitrogenN14.006710.4772
LawrenciumLr262.109618.9298

Computing molar mass step by step

First, compute the number of each atom in PBBIPOAtRnFlMcTsErTmYBLuFmMdNOLr:
P: 2, B: 3, I: 1, O: 2, At: 1, Rn: 1, Fl: 1, Mc: 1, Ts: 1, Er: 1, Tm: 1, Y: 1, Lu: 1, Fm: 1, Md: 1, N: 1, Lr: 1

Then, lookup atomic weights for each element in periodic table:
P: 30.973762, B: 10.811, I: 126.90447, O: 15.9994, At: 209.987148, Rn: 210.990601, Fl: 289.18728, Mc: 288.19249, Ts: 292.20755, Er: 167.259, Tm: 168.93421, Y: 88.90585, Lu: 174.9668, Fm: 257.095105, Md: 258.098431, N: 14.0067, Lr: 262.10963

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (PBBIPOAtRnFlMcTsErTmYBLuFmMdNOLr) = ∑ Counti * Weighti =
Count(P) * Weight(P) + Count(B) * Weight(B) + Count(I) * Weight(I) + Count(O) * Weight(O) + Count(At) * Weight(At) + Count(Rn) * Weight(Rn) + Count(Fl) * Weight(Fl) + Count(Mc) * Weight(Mc) + Count(Ts) * Weight(Ts) + Count(Er) * Weight(Er) + Count(Tm) * Weight(Tm) + Count(Y) * Weight(Y) + Count(Lu) * Weight(Lu) + Count(Fm) * Weight(Fm) + Count(Md) * Weight(Md) + Count(N) * Weight(N) + Count(Lr) * Weight(Lr) =
2 * 30.973762 + 3 * 10.811 + 1 * 126.90447 + 2 * 15.9994 + 1 * 209.987148 + 1 * 210.990601 + 1 * 289.18728 + 1 * 288.19249 + 1 * 292.20755 + 1 * 167.259 + 1 * 168.93421 + 1 * 88.90585 + 1 * 174.9668 + 1 * 257.095105 + 1 * 258.098431 + 1 * 14.0067 + 1 * 262.10963 =
2935.2246 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AtB3ErFlFmILrLuMcMdNO2P2RnTmTsY

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
Please let us know how we can improve this web app.
Menu Balance Molar mass Gas laws Units Chemistry tools Periodic table Chemical forum Symmetry Constants Contribute Contact us
How to cite?
Choose languageDeutschEnglishEspañolFrançaisItalianoNederlandsPolskiPortuguêsРусский中文日本語한국어