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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of NO3H72C18AgBFZnCdHXeKrRnMtBhAtDbLiKNbIrHsAcRfPoReDsLaSgFrRa is 4748.6065 g/mol

Convert between NO3H72C18AgBFZnCdHXeKrRnMtBhAtDbLiKNbIrHsAcRfPoReDsLaSgFrRa weight and moles
CompoundMolesWeight, g
NO3H72C18AgBFZnCdHXeKrRnMtBhAtDbLiKNbIrHsAcRfPoReDsLaSgFrRa

Elemental composition of NO3H72C18AgBFZnCdHXeKrRnMtBhAtDbLiKNbIrHsAcRfPoReDsLaSgFrRa
ElementSymbolAtomic weightAtomsMass percent
NitrogenN14.006710.2950
OxygenO15.999431.0108
HydrogenH1.00794731.5495
CarbonC12.0107184.5528
SilverAg107.868212.2716
BoronB10.81110.2277
FluorineF18.998403210.4001
ZincZn65.3811.3768
CadmiumCd112.41112.3672
XenonXe131.29312.7649
KryptonKr83.79811.7647
RadonRn210.99060114.4432
MeitneriumMt276.151215.8154
BohriumBh272.138015.7309
AstatineAt209.98714814.4221
DubniumDb268.125515.6464
LithiumLi6.94110.1462
PotassiumK39.098310.8234
NiobiumNb92.9063811.9565
IridiumIr192.21714.0479
HassiumHs270.134715.6887
ActiniumAc227.02775214.7809
RutherfordiumRf265.116715.5830
PoloniumPo208.98243014.4009
RheniumRe186.20713.9213
DarmstadtiumDs281.162115.9209
LanthanumLa138.9054712.9252
SeaborgiumSg271.133515.7097
FranciumFr223.01973614.6965
RadiumRa226.02541014.7598

Computing molar mass step by step

First, compute the number of each atom in NO3H72C18AgBFZnCdHXeKrRnMtBhAtDbLiKNbIrHsAcRfPoReDsLaSgFrRa:
N: 1, O: 3, H: 73, C: 18, Ag: 1, B: 1, F: 1, Zn: 1, Cd: 1, Xe: 1, Kr: 1, Rn: 1, Mt: 1, Bh: 1, At: 1, Db: 1, Li: 1, K: 1, Nb: 1, Ir: 1, Hs: 1, Ac: 1, Rf: 1, Po: 1, Re: 1, Ds: 1, La: 1, Sg: 1, Fr: 1, Ra: 1

Then, lookup atomic weights for each element in periodic table:
N: 14.0067, O: 15.9994, H: 1.00794, C: 12.0107, Ag: 107.8682, B: 10.811, F: 18.9984032, Zn: 65.38, Cd: 112.411, Xe: 131.293, Kr: 83.798, Rn: 210.990601, Mt: 276.15116, Bh: 272.13803, At: 209.987148, Db: 268.12545, Li: 6.941, K: 39.0983, Nb: 92.90638, Ir: 192.217, Hs: 270.13465, Ac: 227.0277521, Rf: 265.1167, Po: 208.9824304, Re: 186.207, Ds: 281.16206, La: 138.90547, Sg: 271.13347, Fr: 223.0197359, Ra: 226.0254098

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (NO3H72C18AgBFZnCdHXeKrRnMtBhAtDbLiKNbIrHsAcRfPoReDsLaSgFrRa) = ∑ Counti * Weighti =
Count(N) * Weight(N) + Count(O) * Weight(O) + Count(H) * Weight(H) + Count(C) * Weight(C) + Count(Ag) * Weight(Ag) + Count(B) * Weight(B) + Count(F) * Weight(F) + Count(Zn) * Weight(Zn) + Count(Cd) * Weight(Cd) + Count(Xe) * Weight(Xe) + Count(Kr) * Weight(Kr) + Count(Rn) * Weight(Rn) + Count(Mt) * Weight(Mt) + Count(Bh) * Weight(Bh) + Count(At) * Weight(At) + Count(Db) * Weight(Db) + Count(Li) * Weight(Li) + Count(K) * Weight(K) + Count(Nb) * Weight(Nb) + Count(Ir) * Weight(Ir) + Count(Hs) * Weight(Hs) + Count(Ac) * Weight(Ac) + Count(Rf) * Weight(Rf) + Count(Po) * Weight(Po) + Count(Re) * Weight(Re) + Count(Ds) * Weight(Ds) + Count(La) * Weight(La) + Count(Sg) * Weight(Sg) + Count(Fr) * Weight(Fr) + Count(Ra) * Weight(Ra) =
1 * 14.0067 + 3 * 15.9994 + 73 * 1.00794 + 18 * 12.0107 + 1 * 107.8682 + 1 * 10.811 + 1 * 18.9984032 + 1 * 65.38 + 1 * 112.411 + 1 * 131.293 + 1 * 83.798 + 1 * 210.990601 + 1 * 276.15116 + 1 * 272.13803 + 1 * 209.987148 + 1 * 268.12545 + 1 * 6.941 + 1 * 39.0983 + 1 * 92.90638 + 1 * 192.217 + 1 * 270.13465 + 1 * 227.0277521 + 1 * 265.1167 + 1 * 208.9824304 + 1 * 186.207 + 1 * 281.16206 + 1 * 138.90547 + 1 * 271.13347 + 1 * 223.0197359 + 1 * 226.0254098 =
4748.6065 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C18H73AcAgAtBBhCdDbDsFFrHsIrKKrLaLiMtNNbO3PoRaReRfRnSgXeZn

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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