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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of H120U4Pu4Ra4Np4Md4Am4Rn4Es4Fm4Xe8Cm4Po4Hs4Bh4Sg4Db4 is 15935.4961 g/mol

Convert between H120U4Pu4Ra4Np4Md4Am4Rn4Es4Fm4Xe8Cm4Po4Hs4Bh4Sg4Db4 weight and moles
CompoundMolesWeight, g
H120U4Pu4Ra4Np4Md4Am4Rn4Es4Fm4Xe8Cm4Po4Hs4Bh4Sg4Db4

Elemental composition of H120U4Pu4Ra4Np4Md4Am4Rn4Es4Fm4Xe8Cm4Po4Hs4Bh4Sg4Db4
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.007941200.7590
UraniumU238.0289145.9748
PlutoniumPu238.04956045.9753
RadiumRa226.02541045.6735
NeptuniumNp236.0465745.9251
MendeleviumMd258.09843146.4786
AmericiumAm241.05682946.0508
RadonRn210.99060145.2961
EinsteiniumEs252.0829846.3276
FermiumFm257.09510546.4534
XenonXe131.29386.5912
CuriumCm243.06138946.1011
PoloniumPo208.98243045.2457
HassiumHs270.134746.7807
BohriumBh272.138046.8310
SeaborgiumSg271.133546.8058
DubniumDb268.125546.7303

Computing molar mass step by step

First, compute the number of each atom in H120U4Pu4Ra4Np4Md4Am4Rn4Es4Fm4Xe8Cm4Po4Hs4Bh4Sg4Db4:
H: 120, U: 4, Pu: 4, Ra: 4, Np: 4, Md: 4, Am: 4, Rn: 4, Es: 4, Fm: 4, Xe: 8, Cm: 4, Po: 4, Hs: 4, Bh: 4, Sg: 4, Db: 4

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, U: 238.02891, Pu: 238.0495599, Ra: 226.0254098, Np: 236.04657, Md: 258.098431, Am: 241.0568291, Rn: 210.990601, Es: 252.08298, Fm: 257.095105, Xe: 131.293, Cm: 243.0613891, Po: 208.9824304, Hs: 270.13465, Bh: 272.13803, Sg: 271.13347, Db: 268.12545

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (H120U4Pu4Ra4Np4Md4Am4Rn4Es4Fm4Xe8Cm4Po4Hs4Bh4Sg4Db4) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(U) * Weight(U) + Count(Pu) * Weight(Pu) + Count(Ra) * Weight(Ra) + Count(Np) * Weight(Np) + Count(Md) * Weight(Md) + Count(Am) * Weight(Am) + Count(Rn) * Weight(Rn) + Count(Es) * Weight(Es) + Count(Fm) * Weight(Fm) + Count(Xe) * Weight(Xe) + Count(Cm) * Weight(Cm) + Count(Po) * Weight(Po) + Count(Hs) * Weight(Hs) + Count(Bh) * Weight(Bh) + Count(Sg) * Weight(Sg) + Count(Db) * Weight(Db) =
120 * 1.00794 + 4 * 238.02891 + 4 * 238.0495599 + 4 * 226.0254098 + 4 * 236.04657 + 4 * 258.098431 + 4 * 241.0568291 + 4 * 210.990601 + 4 * 252.08298 + 4 * 257.095105 + 8 * 131.293 + 4 * 243.0613891 + 4 * 208.9824304 + 4 * 270.13465 + 4 * 272.13803 + 4 * 271.13347 + 4 * 268.12545 =
15935.4961 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Am4Bh4Cm4Db4Es4Fm4H120Hs4Md4Np4Po4Pu4Ra4Rn4Sg4U4Xe8

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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