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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of Br27O5C35H7N40PbHLrBhAg12H50AtRnRaReOsRb3WHfYFrU170000PaThLu is 40472819.2140 g/mol

Convert between Br27O5C35H7N40PbHLrBhAg12H50AtRnRaReOsRb3WHfYFrU170000PaThLu weight and moles
CompoundMolesWeight, g
Br27O5C35H7N40PbHLrBhAg12H50AtRnRaReOsRb3WHfYFrU170000PaThLu

Elemental composition of Br27O5C35H7N40PbHLrBhAg12H50AtRnRaReOsRb3WHfYFrU170000PaThLu
ElementSymbolAtomic weightAtomsMass percent
BromineBr79.904270.0053
OxygenO15.999450.0002
CarbonC12.0107350.0010
HydrogenH1.00794580.0001
NitrogenN14.0067400.0014
LeadPb207.210.0005
LawrenciumLr262.109610.0006
BohriumBh272.138010.0007
SilverAg107.8682120.0032
AstatineAt209.98714810.0005
RadonRn210.99060110.0005
RadiumRa226.02541010.0006
RheniumRe186.20710.0005
OsmiumOs190.2310.0005
RubidiumRb85.467830.0006
TungstenW183.8410.0005
HafniumHf178.4910.0004
YttriumY88.9058510.0002
FranciumFr223.01973610.0006
UraniumU238.0289117000099.9805
ProtactiniumPa231.0358810.0006
ThoriumTh232.0380610.0006
LutetiumLu174.966810.0004

Computing molar mass step by step

First, compute the number of each atom in Br27O5C35H7N40PbHLrBhAg12H50AtRnRaReOsRb3WHfYFrU170000PaThLu:
Br: 27, O: 5, C: 35, H: 58, N: 40, Pb: 1, Lr: 1, Bh: 1, Ag: 12, At: 1, Rn: 1, Ra: 1, Re: 1, Os: 1, Rb: 3, W: 1, Hf: 1, Y: 1, Fr: 1, U: 170000, Pa: 1, Th: 1, Lu: 1

Then, lookup atomic weights for each element in periodic table:
Br: 79.904, O: 15.9994, C: 12.0107, H: 1.00794, N: 14.0067, Pb: 207.2, Lr: 262.10963, Bh: 272.13803, Ag: 107.8682, At: 209.987148, Rn: 210.990601, Ra: 226.0254098, Re: 186.207, Os: 190.23, Rb: 85.4678, W: 183.84, Hf: 178.49, Y: 88.90585, Fr: 223.0197359, U: 238.02891, Pa: 231.03588, Th: 232.03806, Lu: 174.9668

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (Br27O5C35H7N40PbHLrBhAg12H50AtRnRaReOsRb3WHfYFrU170000PaThLu) = ∑ Counti * Weighti =
Count(Br) * Weight(Br) + Count(O) * Weight(O) + Count(C) * Weight(C) + Count(H) * Weight(H) + Count(N) * Weight(N) + Count(Pb) * Weight(Pb) + Count(Lr) * Weight(Lr) + Count(Bh) * Weight(Bh) + Count(Ag) * Weight(Ag) + Count(At) * Weight(At) + Count(Rn) * Weight(Rn) + Count(Ra) * Weight(Ra) + Count(Re) * Weight(Re) + Count(Os) * Weight(Os) + Count(Rb) * Weight(Rb) + Count(W) * Weight(W) + Count(Hf) * Weight(Hf) + Count(Y) * Weight(Y) + Count(Fr) * Weight(Fr) + Count(U) * Weight(U) + Count(Pa) * Weight(Pa) + Count(Th) * Weight(Th) + Count(Lu) * Weight(Lu) =
27 * 79.904 + 5 * 15.9994 + 35 * 12.0107 + 58 * 1.00794 + 40 * 14.0067 + 1 * 207.2 + 1 * 262.10963 + 1 * 272.13803 + 12 * 107.8682 + 1 * 209.987148 + 1 * 210.990601 + 1 * 226.0254098 + 1 * 186.207 + 1 * 190.23 + 3 * 85.4678 + 1 * 183.84 + 1 * 178.49 + 1 * 88.90585 + 1 * 223.0197359 + 170000 * 238.02891 + 1 * 231.03588 + 1 * 232.03806 + 1 * 174.9668 =
40472819.2140 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C35H58Ag12AtBhBr27FrHfLrLuN40O5OsPaPbRaRb3ReRnThU170000WY

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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