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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeScCaCoCuOFClNaNeCsUVWYAcEsSeZnPSAuArAlAmFmCmErReTm is 3250.7180 g/mol

Convert between HHeLiBeScCaCoCuOFClNaNeCsUVWYAcEsSeZnPSAuArAlAmFmCmErReTm weight and moles
CompoundMolesWeight, g
HHeLiBeScCaCoCuOFClNaNeCsUVWYAcEsSeZnPSAuArAlAmFmCmErReTm

Elemental composition of HHeLiBeScCaCoCuOFClNaNeCsUVWYAcEsSeZnPSAuArAlAmFmCmErReTm
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0310
HeliumHe4.00260210.1231
LithiumLi6.94110.2135
BerylliumBe9.01218210.2772
ScandiumSc44.95591211.3830
CalciumCa40.07811.2329
CobaltCo58.93319511.8129
CopperCu63.54611.9548
OxygenO15.999410.4922
FluorineF18.998403210.5844
ChlorineCl35.45311.0906
SodiumNa22.9897692810.7072
NeonNe20.179710.6208
CesiumCs132.905451914.0885
UraniumU238.0289117.3223
VanadiumV50.941511.5671
TungstenW183.8415.6554
YttriumY88.9058512.7350
ActiniumAc227.02775216.9839
EinsteiniumEs252.0829817.7547
SeleniumSe78.9612.4290
ZincZn65.3812.0112
PhosphorusP30.97376210.9528
SulfurS32.06510.9864
GoldAu196.96656916.0592
ArgonAr39.94811.2289
AluminumAl26.981538610.8300
AmericiumAm241.05682917.4155
FermiumFm257.09510517.9089
CuriumCm243.06138917.4772
ErbiumEr167.25915.1453
RheniumRe186.20715.7282
ThuliumTm168.9342115.1968

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeScCaCoCuOFClNaNeCsUVWYAcEsSeZnPSAuArAlAmFmCmErReTm:
H: 1, He: 1, Li: 1, Be: 1, Sc: 1, Ca: 1, Co: 1, Cu: 1, O: 1, F: 1, Cl: 1, Na: 1, Ne: 1, Cs: 1, U: 1, V: 1, W: 1, Y: 1, Ac: 1, Es: 1, Se: 1, Zn: 1, P: 1, S: 1, Au: 1, Ar: 1, Al: 1, Am: 1, Fm: 1, Cm: 1, Er: 1, Re: 1, Tm: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, Sc: 44.955912, Ca: 40.078, Co: 58.933195, Cu: 63.546, O: 15.9994, F: 18.9984032, Cl: 35.453, Na: 22.98976928, Ne: 20.1797, Cs: 132.9054519, U: 238.02891, V: 50.9415, W: 183.84, Y: 88.90585, Ac: 227.0277521, Es: 252.08298, Se: 78.96, Zn: 65.38, P: 30.973762, S: 32.065, Au: 196.966569, Ar: 39.948, Al: 26.9815386, Am: 241.0568291, Fm: 257.095105, Cm: 243.0613891, Er: 167.259, Re: 186.207, Tm: 168.93421

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeScCaCoCuOFClNaNeCsUVWYAcEsSeZnPSAuArAlAmFmCmErReTm) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(Sc) * Weight(Sc) + Count(Ca) * Weight(Ca) + Count(Co) * Weight(Co) + Count(Cu) * Weight(Cu) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(Cl) * Weight(Cl) + Count(Na) * Weight(Na) + Count(Ne) * Weight(Ne) + Count(Cs) * Weight(Cs) + Count(U) * Weight(U) + Count(V) * Weight(V) + Count(W) * Weight(W) + Count(Y) * Weight(Y) + Count(Ac) * Weight(Ac) + Count(Es) * Weight(Es) + Count(Se) * Weight(Se) + Count(Zn) * Weight(Zn) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Au) * Weight(Au) + Count(Ar) * Weight(Ar) + Count(Al) * Weight(Al) + Count(Am) * Weight(Am) + Count(Fm) * Weight(Fm) + Count(Cm) * Weight(Cm) + Count(Er) * Weight(Er) + Count(Re) * Weight(Re) + Count(Tm) * Weight(Tm) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 44.955912 + 1 * 40.078 + 1 * 58.933195 + 1 * 63.546 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 35.453 + 1 * 22.98976928 + 1 * 20.1797 + 1 * 132.9054519 + 1 * 238.02891 + 1 * 50.9415 + 1 * 183.84 + 1 * 88.90585 + 1 * 227.0277521 + 1 * 252.08298 + 1 * 78.96 + 1 * 65.38 + 1 * 30.973762 + 1 * 32.065 + 1 * 196.966569 + 1 * 39.948 + 1 * 26.9815386 + 1 * 241.0568291 + 1 * 257.095105 + 1 * 243.0613891 + 1 * 167.259 + 1 * 186.207 + 1 * 168.93421 =
3250.7180 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAlAmArAuBeCaClCmCoCsCuErEsFFmHHeLiNaNeOPReSScSeTmUVWYZn

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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