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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSr is 1554.9477 g/mol

Convert between HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSr weight and moles
CompoundMolesWeight, g
HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSr

Elemental composition of HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSr
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0648
LithiumLi6.94110.4464
BerylliumBe9.01218210.5796
BoronB10.81110.6953
CarbonC12.010710.7724
NitrogenN14.006710.9008
OxygenO15.999411.0289
FluorineF18.998403211.2218
SodiumNa22.9897692811.4785
MagnesiumMg24.305011.5631
AluminumAl26.981538611.7352
SiliconSi28.085511.8062
PhosphorusP30.97376211.9919
SulfurS32.06512.0621
ChlorineCl35.45312.2800
PotassiumK39.098312.5144
CalciumCa40.07812.5774
ScandiumSc44.95591212.8912
TitaniumTi47.86713.0784
VanadiumV50.941513.2761
ChromiumCr51.996113.3439
ManganeseMn54.93804513.5331
IronFe55.84513.5914
CobaltCo58.93319513.7900
NickelNi58.693413.7746
CopperCu63.54614.0867
ZincZn65.3814.2046
GalliumGa69.72314.4839
GermaniumGe72.6414.6715
ArsenicAs74.9216014.8183
SeleniumSe78.9615.0780
BromineBr79.90415.1387
KryptonKr83.79815.3891
RubidiumRb85.467815.4965
StrontiumSr87.6215.6349

Computing molar mass step by step

First, compute the number of each atom in HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSr:
H: 1, Li: 1, Be: 1, B: 1, C: 1, N: 1, O: 1, F: 1, Na: 1, Mg: 1, Al: 1, Si: 1, P: 1, S: 1, Cl: 1, K: 1, Ca: 1, Sc: 1, Ti: 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

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, Li: 6.941, Be: 9.012182, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, Na: 22.98976928, Mg: 24.305, Al: 26.9815386, Si: 28.0855, P: 30.973762, S: 32.065, Cl: 35.453, 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, Se: 78.96, Br: 79.904, Kr: 83.798, Rb: 85.4678, Sr: 87.62

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HLiBeBCNOFNaMgAlSiPSClKCaScTiVCrMnFeCoNiCuZnGaGeAsSeBrKrRbSr) = ∑ Counti * Weighti =
Count(H) * Weight(H) + 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(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(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) + Count(Se) * Weight(Se) + Count(Br) * Weight(Br) + Count(Kr) * Weight(Kr) + Count(Rb) * Weight(Rb) + Count(Sr) * Weight(Sr) =
1 * 1.00794 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 22.98976928 + 1 * 24.305 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 30.973762 + 1 * 32.065 + 1 * 35.453 + 1 * 39.0983 + 1 * 40.078 + 1 * 44.955912 + 1 * 47.867 + 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 =
1554.9477 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlAsBBeBrCaClCoCrCuFFeGaGeKKrLiMgMnNNaNiOPRbSScSeSiSrTiVZn

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, 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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