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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBe9BCNOFNeNa7MgAlSiPS4ClArKCaScTiVCrMnFeCo4NiCuZnGaGeAs is 1686.3589 g/mol

Convert between HHeLiBe9BCNOFNeNa7MgAlSiPS4ClArKCaScTiVCrMnFeCo4NiCuZnGaGeAs weight and moles
CompoundMolesWeight, g
HHeLiBe9BCNOFNeNa7MgAlSiPS4ClArKCaScTiVCrMnFeCo4NiCuZnGaGeAs

Elemental composition of HHeLiBe9BCNOFNeNa7MgAlSiPS4ClArKCaScTiVCrMnFeCo4NiCuZnGaGeAs
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0598
HeliumHe4.00260210.2374
LithiumLi6.94110.4116
BerylliumBe9.01218294.8097
BoronB10.81110.6411
CarbonC12.010710.7122
NitrogenN14.006710.8306
OxygenO15.999410.9488
FluorineF18.998403211.1266
NeonNe20.179711.1966
SodiumNa22.9897692879.5429
MagnesiumMg24.305011.4413
AluminumAl26.981538611.6000
SiliconSi28.085511.6655
PhosphorusP30.97376211.8367
SulfurS32.06547.6057
ChlorineCl35.45312.1023
ArgonAr39.94812.3689
PotassiumK39.098312.3185
CalciumCa40.07812.3766
ScandiumSc44.95591212.6659
TitaniumTi47.86712.8385
VanadiumV50.941513.0208
ChromiumCr51.996113.0833
ManganeseMn54.93804513.2578
IronFe55.84513.3116
CobaltCo58.933195413.9788
NickelNi58.693413.4805
CopperCu63.54613.7682
ZincZn65.3813.8770
GalliumGa69.72314.1345
GermaniumGe72.6414.3075
ArsenicAs74.9216014.4428

Computing molar mass step by step

First, compute the number of each atom in HHeLiBe9BCNOFNeNa7MgAlSiPS4ClArKCaScTiVCrMnFeCo4NiCuZnGaGeAs:
H: 1, He: 1, Li: 1, Be: 9, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Na: 7, Mg: 1, Al: 1, Si: 1, P: 1, S: 4, Cl: 1, Ar: 1, K: 1, Ca: 1, Sc: 1, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 4, Ni: 1, Cu: 1, Zn: 1, Ga: 1, Ge: 1, As: 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, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, Ar: 39.948, K: 39.0983, Ca: 40.078, Sc: 44.955912, Ti: 47.867, V: 50.9415, Cr: 51.9961, Mn: 54.938045, Fe: 55.845, Co: 58.933195, Ni: 58.6934, Cu: 63.546, Zn: 65.38, Ga: 69.723, Ge: 72.64, As: 74.9216

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBe9BCNOFNeNa7MgAlSiPS4ClArKCaScTiVCrMnFeCo4NiCuZnGaGeAs) = ∑ 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(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + Count(Ti) * Weight(Ti) + Count(V) * Weight(V) + Count(Cr) * Weight(Cr) + Count(Mn) * Weight(Mn) + Count(Fe) * Weight(Fe) + Count(Co) * Weight(Co) + Count(Ni) * Weight(Ni) + Count(Cu) * Weight(Cu) + Count(Zn) * Weight(Zn) + Count(Ga) * Weight(Ga) + Count(Ge) * Weight(Ge) + Count(As) * Weight(As) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 9 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 7 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 4 * 32.065 + 1 * 35.453 + 1 * 39.948 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 50.9415 + 1 * 51.9961 + 1 * 54.938045 + 1 * 55.845 + 4 * 58.933195 + 1 * 58.6934 + 1 * 63.546 + 1 * 65.38 + 1 * 69.723 + 1 * 72.64 + 1 * 74.9216 =
1686.3589 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBe9CaClCo4CrCuFFeGaGeHeKLiMgMnNNa7NeNiOPS4ScSiTiVZn

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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