Printed from https://www.webqc.org

Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCNOFNeArXeSnSbNaClAlCuAgAuUPNeAmSgHgWWWWWWWWWWWWWFrF is 4612.3865 g/mol

Convert between HHeLiBeBCNOFNeArXeSnSbNaClAlCuAgAuUPNeAmSgHgWWWWWWWWWWWWWFrF weight and moles
CompoundMolesWeight, g
HHeLiBeBCNOFNeArXeSnSbNaClAlCuAgAuUPNeAmSgHgWWWWWWWWWWWWWFrF

Elemental composition of HHeLiBeBCNOFNeArXeSnSbNaClAlCuAgAuUPNeAmSgHgWWWWWWWWWWWWWFrF
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0219
HeliumHe4.00260210.0868
LithiumLi6.94110.1505
BerylliumBe9.01218210.1954
BoronB10.81110.2344
CarbonC12.010710.2604
NitrogenN14.006710.3037
OxygenO15.999410.3469
FluorineF18.998403220.8238
NeonNe20.179720.8750
ArgonAr39.94810.8661
XenonXe131.29312.8465
TinSn118.71012.5737
AntimonySb121.76012.6398
SodiumNa22.9897692810.4984
ChlorineCl35.45310.7686
AluminumAl26.981538610.5850
CopperCu63.54611.3777
SilverAg107.868212.3387
GoldAu196.96656914.2704
UraniumU238.0289115.1606
PhosphorusP30.97376210.6715
AmericiumAm241.05682915.2263
SeaborgiumSg271.133515.8784
MercuryHg200.5914.3489
TungstenW183.841351.8153
FranciumFr223.01973614.8352

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCNOFNeArXeSnSbNaClAlCuAgAuUPNeAmSgHgWWWWWWWWWWWWWFrF:
H: 1, He: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 2, Ne: 2, Ar: 1, Xe: 1, Sn: 1, Sb: 1, Na: 1, Cl: 1, Al: 1, Cu: 1, Ag: 1, Au: 1, U: 1, P: 1, Am: 1, Sg: 1, Hg: 1, W: 13, Fr: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Ne: 20.1797, Ar: 39.948, Xe: 131.293, Sn: 118.71, Sb: 121.76, Na: 22.98976928, Cl: 35.453, Al: 26.9815386, Cu: 63.546, Ag: 107.8682, Au: 196.966569, U: 238.02891, P: 30.973762, Am: 241.0568291, Sg: 271.13347, Hg: 200.59, W: 183.84, Fr: 223.0197359

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCNOFNeArXeSnSbNaClAlCuAgAuUPNeAmSgHgWWWWWWWWWWWWWFrF) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Ar) * Weight(Ar) + Count(Xe) * Weight(Xe) + Count(Sn) * Weight(Sn) + Count(Sb) * Weight(Sb) + Count(Na) * Weight(Na) + Count(Cl) * Weight(Cl) + Count(Al) * Weight(Al) + Count(Cu) * Weight(Cu) + Count(Ag) * Weight(Ag) + Count(Au) * Weight(Au) + Count(U) * Weight(U) + Count(P) * Weight(P) + Count(Am) * Weight(Am) + Count(Sg) * Weight(Sg) + Count(Hg) * Weight(Hg) + Count(W) * Weight(W) + Count(Fr) * Weight(Fr) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 2 * 18.9984032 + 2 * 20.1797 + 1 * 39.948 + 1 * 131.293 + 1 * 118.71 + 1 * 121.76 + 1 * 22.98976928 + 1 * 35.453 + 1 * 26.9815386 + 1 * 63.546 + 1 * 107.8682 + 1 * 196.966569 + 1 * 238.02891 + 1 * 30.973762 + 1 * 241.0568291 + 1 * 271.13347 + 1 * 200.59 + 13 * 183.84 + 1 * 223.0197359 =
4612.3865 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgAlAmArAuBBeClCuF2FrHeHgLiNNaNe2OPSbSgSnUW13Xe

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