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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HBCNOFPSKVYIUHeLiBeNeNaMgAlSiClArCaScTiCrMnFeCoNiCuZnGaGeAs is 1657.1675 g/mol

Convert between HBCNOFPSKVYIUHeLiBeNeNaMgAlSiClArCaScTiCrMnFeCoNiCuZnGaGeAs weight and moles
CompoundMolesWeight, g
HBCNOFPSKVYIUHeLiBeNeNaMgAlSiClArCaScTiCrMnFeCoNiCuZnGaGeAs

Elemental composition of HBCNOFPSKVYIUHeLiBeNeNaMgAlSiClArCaScTiCrMnFeCoNiCuZnGaGeAs
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0608
BoronB10.81110.6524
CarbonC12.010710.7248
NitrogenN14.006710.8452
OxygenO15.999410.9655
FluorineF18.998403211.1464
PhosphorusP30.97376211.8691
SulfurS32.06511.9349
PotassiumK39.098312.3593
VanadiumV50.941513.0740
YttriumY88.9058515.3649
IodineI126.9044717.6579
UraniumU238.02891114.3636
HeliumHe4.00260210.2415
LithiumLi6.94110.4188
BerylliumBe9.01218210.5438
NeonNe20.179711.2177
SodiumNa22.9897692811.3873
MagnesiumMg24.305011.4667
AluminumAl26.981538611.6282
SiliconSi28.085511.6948
ChlorineCl35.45312.1394
ArgonAr39.94812.4106
CalciumCa40.07812.4185
ScandiumSc44.95591212.7128
TitaniumTi47.86712.8885
ChromiumCr51.996113.1376
ManganeseMn54.93804513.3152
IronFe55.84513.3699
CobaltCo58.93319513.5563
NickelNi58.693413.5418
CopperCu63.54613.8346
ZincZn65.3813.9453
GalliumGa69.72314.2074
GermaniumGe72.6414.3834
ArsenicAs74.9216014.5211

Computing molar mass step by step

First, compute the number of each atom in HBCNOFPSKVYIUHeLiBeNeNaMgAlSiClArCaScTiCrMnFeCoNiCuZnGaGeAs:
H: 1, B: 1, C: 1, N: 1, O: 1, F: 1, P: 1, S: 1, K: 1, V: 1, Y: 1, I: 1, U: 1, He: 1, Li: 1, Be: 1, Ne: 1, Na: 1, Mg: 1, Al: 1, Si: 1, Cl: 1, Ar: 1, Ca: 1, Sc: 1, Ti: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1, 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, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, P: 30.973762, S: 32.065, K: 39.0983, V: 50.9415, Y: 88.90585, I: 126.90447, U: 238.02891, He: 4.002602, Li: 6.941, Be: 9.012182, Ne: 20.1797, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, Cl: 35.453, Ar: 39.948, Ca: 40.078, Sc: 44.955912, Ti: 47.867, 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 (HBCNOFPSKVYIUHeLiBeNeNaMgAlSiClArCaScTiCrMnFeCoNiCuZnGaGeAs) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(K) * Weight(K) + Count(V) * Weight(V) + Count(Y) * Weight(Y) + Count(I) * Weight(I) + Count(U) * Weight(U) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(Ne) * Weight(Ne) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(Cl) * Weight(Cl) + Count(Ar) * Weight(Ar) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + Count(Ti) * Weight(Ti) + 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 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 30.973762 + 1 * 32.065 + 1 * 39.0983 + 1 * 50.9415 + 1 * 88.90585 + 1 * 126.90447 + 1 * 238.02891 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 35.453 + 1 * 39.948 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 1 * 51.9961 + 1 * 54.938045 + 1 * 55.845 + 1 * 58.933195 + 1 * 58.6934 + 1 * 63.546 + 1 * 65.38 + 1 * 69.723 + 1 * 72.64 + 1 * 74.9216 =
1657.1675 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBBeCaClCoCrCuFFeGaGeHeIKLiMgMnNNaNeNiOPSScSiTiUVYZn

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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