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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of OCHNCaPKSNaClMgHeLiBFNeAlSiArTiVCrMnFeCoNiCuZnAsSeKrMoRuRhPd is 1576.1107 g/mol

Convert between OCHNCaPKSNaClMgHeLiBFNeAlSiArTiVCrMnFeCoNiCuZnAsSeKrMoRuRhPd weight and moles
CompoundMolesWeight, g
OCHNCaPKSNaClMgHeLiBFNeAlSiArTiVCrMnFeCoNiCuZnAsSeKrMoRuRhPd

Elemental composition of OCHNCaPKSNaClMgHeLiBFNeAlSiArTiVCrMnFeCoNiCuZnAsSeKrMoRuRhPd
ElementSymbolAtomic weightAtomsMass percent
OxygenO15.999411.0151
CarbonC12.010710.7620
HydrogenH1.0079410.0640
NitrogenN14.006710.8887
CalciumCa40.07812.5428
PhosphorusP30.97376211.9652
PotassiumK39.098312.4807
SulfurS32.06512.0344
SodiumNa22.9897692811.4586
ChlorineCl35.45312.2494
MagnesiumMg24.305011.5421
HeliumHe4.00260210.2540
LithiumLi6.94110.4404
BoronB10.81110.6859
FluorineF18.998403211.2054
NeonNe20.179711.2803
AluminumAl26.981538611.7119
SiliconSi28.085511.7819
ArgonAr39.94812.5346
TitaniumTi47.86713.0370
VanadiumV50.941513.2321
ChromiumCr51.996113.2990
ManganeseMn54.93804513.4857
IronFe55.84513.5432
CobaltCo58.93319513.7392
NickelNi58.693413.7239
CopperCu63.54614.0318
ZincZn65.3814.1482
ArsenicAs74.9216014.7536
SeleniumSe78.9615.0098
KryptonKr83.79815.3168
MolybdenumMo95.9616.0884
RutheniumRu101.0716.4126
RhodiumRh102.9055016.5291
PalladiumPd106.4216.7521

Computing molar mass step by step

First, compute the number of each atom in OCHNCaPKSNaClMgHeLiBFNeAlSiArTiVCrMnFeCoNiCuZnAsSeKrMoRuRhPd:
O: 1, C: 1, H: 1, N: 1, Ca: 1, P: 1, K: 1, S: 1, Na: 1, Cl: 1, Mg: 1, He: 1, Li: 1, B: 1, F: 1, Ne: 1, Al: 1, Si: 1, Ar: 1, Ti: 1, V: 1, Cr: 1, Mn: 1, Fe: 1, Co: 1, Ni: 1, Cu: 1, Zn: 1, As: 1, Se: 1, Kr: 1, Mo: 1, Ru: 1, Rh: 1, Pd: 1

Then, lookup atomic weights for each element in periodic table:
O: 15.9994, C: 12.0107, H: 1.00794, N: 14.0067, Ca: 40.078, P: 30.973762, K: 39.0983, S: 32.065, Na: 22.98976928, Cl: 35.453, Mg: 24.305, He: 4.002602, Li: 6.941, B: 10.811, F: 18.9984032, Ne: 20.1797, Al: 26.9815386, Si: 28.0855, Ar: 39.948, 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, As: 74.9216, Se: 78.96, Kr: 83.798, Mo: 95.96, Ru: 101.07, Rh: 102.9055, Pd: 106.42

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (OCHNCaPKSNaClMgHeLiBFNeAlSiArTiVCrMnFeCoNiCuZnAsSeKrMoRuRhPd) = ∑ Counti * Weighti =
Count(O) * Weight(O) + Count(C) * Weight(C) + Count(H) * Weight(H) + Count(N) * Weight(N) + Count(Ca) * Weight(Ca) + Count(P) * Weight(P) + Count(K) * Weight(K) + Count(S) * Weight(S) + Count(Na) * Weight(Na) + Count(Cl) * Weight(Cl) + Count(Mg) * Weight(Mg) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(B) * Weight(B) + Count(F) * Weight(F) + Count(Ne) * Weight(Ne) + Count(Al) * Weight(Al) + Count(Si) * Weight(Si) + Count(Ar) * Weight(Ar) + 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(As) * Weight(As) + Count(Se) * Weight(Se) + Count(Kr) * Weight(Kr) + Count(Mo) * Weight(Mo) + Count(Ru) * Weight(Ru) + Count(Rh) * Weight(Rh) + Count(Pd) * Weight(Pd) =
1 * 15.9994 + 1 * 12.0107 + 1 * 1.00794 + 1 * 14.0067 + 1 * 40.078 + 1 * 30.973762 + 1 * 39.0983 + 1 * 32.065 + 1 * 22.98976928 + 1 * 35.453 + 1 * 24.305 + 1 * 4.002602 + 1 * 6.941 + 1 * 10.811 + 1 * 18.9984032 + 1 * 20.1797 + 1 * 26.9815386 + 1 * 28.0855 + 1 * 39.948 + 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 * 74.9216 + 1 * 78.96 + 1 * 83.798 + 1 * 95.96 + 1 * 101.07 + 1 * 102.9055 + 1 * 106.42 =
1576.1107 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAlArAsBCaClCoCrCuFFeHeKKrLiMgMnMoNNaNeNiOPPdRhRuSSeSiTiVZn

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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