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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBCNOFNeNaKCaScVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSrYZr is 1533.5291 g/mol

Convert between HHeLiBeBCNOFNeNaKCaScVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSrYZr weight and moles
CompoundMolesWeight, g
HHeLiBeBCNOFNeNaKCaScVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSrYZr

Elemental composition of HHeLiBeBCNOFNeNaKCaScVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSrYZr
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0657
HeliumHe4.00260210.2610
LithiumLi6.94110.4526
BerylliumBe9.01218210.5877
BoronB10.81110.7050
CarbonC12.010710.7832
NitrogenN14.006710.9134
OxygenO15.999411.0433
FluorineF18.998403211.2389
NeonNe20.179711.3159
SodiumNa22.9897692811.4991
PotassiumK39.098312.5496
CalciumCa40.07812.6134
ScandiumSc44.95591212.9315
VanadiumV50.941513.3218
ChromiumCr51.996113.3906
ManganeseMn54.93804513.5825
IronFe55.84513.6416
CobaltCo58.93319513.8430
NickelNi58.693413.8273
CopperCu63.54614.1438
ZincZn65.3814.2634
GalliumGa69.72314.5466
GermaniumGe72.6414.7368
ArsenicAs74.9216014.8856
SeleniumSe78.9615.1489
BromineBr79.90415.2105
KryptonKr83.79815.4644
RubidiumRb85.467815.5733
StrontiumSr87.6215.7136
YttriumY88.9058515.7975
ZirconiumZr91.22415.9486

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBCNOFNeNaKCaScVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSrYZr:
H: 1, He: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Ne: 1, Na: 1, K: 1, Ca: 1, Sc: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1, Ni: 1, Cu: 1, Zn: 1, Ga: 1, Ge: 1, As: 1, Se: 1, Br: 1, Kr: 1, Rb: 1, Sr: 1, Y: 1, Zr: 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, K: 39.0983, Ca: 40.078, Sc: 44.955912, 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, Se: 78.96, Br: 79.904, Kr: 83.798, Rb: 85.4678, Sr: 87.62, Y: 88.90585, Zr: 91.224

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBCNOFNeNaKCaScVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSrYZr) = ∑ 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(K) * Weight(K) + Count(Ca) * Weight(Ca) + Count(Sc) * Weight(Sc) + 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) + Count(Se) * Weight(Se) + Count(Br) * Weight(Br) + Count(Kr) * Weight(Kr) + Count(Rb) * Weight(Rb) + Count(Sr) * Weight(Sr) + Count(Y) * Weight(Y) + Count(Zr) * Weight(Zr) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 22.98976928 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 50.9415 + 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 + 1 * 78.96 + 1 * 79.904 + 1 * 83.798 + 1 * 85.4678 + 1 * 87.62 + 1 * 88.90585 + 1 * 91.224 =
1533.5291 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAsBBeBrCaCoCrCuFFeGaGeHeKKrLiMnNNaNeNiORbScSeSrVYZnZr

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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