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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of KrRbSrYZrNbMoTcRuRhPdAgCdInSnTeIXeCsBaLaCePrNdPmSmEuGdTb is 3470.6042 g/mol

Convert between KrRbSrYZrNbMoTcRuRhPdAgCdInSnTeIXeCsBaLaCePrNdPmSmEuGdTb weight and moles
CompoundMolesWeight, g
KrRbSrYZrNbMoTcRuRhPdAgCdInSnTeIXeCsBaLaCePrNdPmSmEuGdTb

Elemental composition of KrRbSrYZrNbMoTcRuRhPdAgCdInSnTeIXeCsBaLaCePrNdPmSmEuGdTb
ElementSymbolAtomic weightAtomsMass percent
KryptonKr83.79812.4145
RubidiumRb85.467812.4626
StrontiumSr87.6212.5246
YttriumY88.9058512.5617
ZirconiumZr91.22412.6285
NiobiumNb92.9063812.6770
MolybdenumMo95.9612.7649
TechnetiumTc96.90636512.7922
RutheniumRu101.0712.9122
RhodiumRh102.9055012.9651
PalladiumPd106.4213.0663
SilverAg107.868213.1081
CadmiumCd112.41113.2389
IndiumIn114.81813.3083
TinSn118.71013.4204
TelluriumTe127.6013.6766
IodineI126.9044713.6566
XenonXe131.29313.7830
CesiumCs132.905451913.8295
BariumBa137.32713.9569
LanthanumLa138.9054714.0023
CeriumCe140.11614.0372
PraseodymiumPr140.9076514.0600
NeodymiumNd144.24214.1561
PromethiumPm144.91274914.1754
SamariumSm150.3614.3324
EuropiumEu151.96414.3786
GadoliniumGd157.2514.5309
TerbiumTb158.9253514.5792

Computing molar mass step by step

First, compute the number of each atom in KrRbSrYZrNbMoTcRuRhPdAgCdInSnTeIXeCsBaLaCePrNdPmSmEuGdTb:
Kr: 1, Rb: 1, Sr: 1, Y: 1, Zr: 1, Nb: 1, Mo: 1, Tc: 1, Ru: 1, Rh: 1, Pd: 1, Ag: 1, Cd: 1, In: 1, Sn: 1, Te: 1, I: 1, Xe: 1, Cs: 1, Ba: 1, La: 1, Ce: 1, Pr: 1, Nd: 1, Pm: 1, Sm: 1, Eu: 1, Gd: 1, Tb: 1

Then, lookup atomic weights for each element in periodic table:
Kr: 83.798, Rb: 85.4678, Sr: 87.62, Y: 88.90585, Zr: 91.224, Nb: 92.90638, Mo: 95.96, Tc: 96.906365, Ru: 101.07, Rh: 102.9055, Pd: 106.42, Ag: 107.8682, Cd: 112.411, In: 114.818, Sn: 118.71, Te: 127.6, I: 126.90447, Xe: 131.293, Cs: 132.9054519, Ba: 137.327, La: 138.90547, Ce: 140.116, Pr: 140.90765, Nd: 144.242, Pm: 144.912749, Sm: 150.36, Eu: 151.964, Gd: 157.25, Tb: 158.92535

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (KrRbSrYZrNbMoTcRuRhPdAgCdInSnTeIXeCsBaLaCePrNdPmSmEuGdTb) = ∑ Counti * Weighti =
Count(Kr) * Weight(Kr) + Count(Rb) * Weight(Rb) + Count(Sr) * Weight(Sr) + Count(Y) * Weight(Y) + Count(Zr) * Weight(Zr) + Count(Nb) * Weight(Nb) + Count(Mo) * Weight(Mo) + Count(Tc) * Weight(Tc) + Count(Ru) * Weight(Ru) + Count(Rh) * Weight(Rh) + Count(Pd) * Weight(Pd) + Count(Ag) * Weight(Ag) + Count(Cd) * Weight(Cd) + Count(In) * Weight(In) + Count(Sn) * Weight(Sn) + Count(Te) * Weight(Te) + Count(I) * Weight(I) + Count(Xe) * Weight(Xe) + Count(Cs) * Weight(Cs) + Count(Ba) * Weight(Ba) + Count(La) * Weight(La) + Count(Ce) * Weight(Ce) + Count(Pr) * Weight(Pr) + Count(Nd) * Weight(Nd) + Count(Pm) * Weight(Pm) + Count(Sm) * Weight(Sm) + Count(Eu) * Weight(Eu) + Count(Gd) * Weight(Gd) + Count(Tb) * Weight(Tb) =
1 * 83.798 + 1 * 85.4678 + 1 * 87.62 + 1 * 88.90585 + 1 * 91.224 + 1 * 92.90638 + 1 * 95.96 + 1 * 96.906365 + 1 * 101.07 + 1 * 102.9055 + 1 * 106.42 + 1 * 107.8682 + 1 * 112.411 + 1 * 114.818 + 1 * 118.71 + 1 * 127.6 + 1 * 126.90447 + 1 * 131.293 + 1 * 132.9054519 + 1 * 137.327 + 1 * 138.90547 + 1 * 140.116 + 1 * 140.90765 + 1 * 144.242 + 1 * 144.912749 + 1 * 150.36 + 1 * 151.964 + 1 * 157.25 + 1 * 158.92535 =
3470.6042 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgBaCdCeCsEuGdIInKrLaMoNbNdPdPmPrRbRhRuSmSnSrTbTcTeXeYZr

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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