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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of KrRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTb is 3592.3642 g/mol

Convert between KrRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTb weight and moles
CompoundMolesWeight, g
KrRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTb

Elemental composition of KrRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTb
ElementSymbolAtomic weightAtomsMass percent
KryptonKr83.79812.3327
RubidiumRb85.467812.3792
StrontiumSr87.6212.4391
YttriumY88.9058512.4749
ZirconiumZr91.22412.5394
NiobiumNb92.9063812.5862
MolybdenumMo95.9612.6712
TechnetiumTc96.90636512.6976
RutheniumRu101.0712.8135
RhodiumRh102.9055012.8646
PalladiumPd106.4212.9624
SilverAg107.868213.0027
CadmiumCd112.41113.1292
IndiumIn114.81813.1962
TinSn118.71013.3045
AntimonySb121.76013.3894
TelluriumTe127.6013.5520
IodineI126.9044713.5326
XenonXe131.29313.6548
CesiumCs132.905451913.6997
BariumBa137.32713.8227
LanthanumLa138.9054713.8667
CeriumCe140.11613.9004
PraseodymiumPr140.9076513.9224
NeodymiumNd144.24214.0152
PromethiumPm144.91274914.0339
SamariumSm150.3614.1855
EuropiumEu151.96414.2302
GadoliniumGd157.2514.3773
TerbiumTb158.9253514.4240

Computing molar mass step by step

First, compute the number of each atom in KrRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTb:
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, Sb: 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, Sb: 121.76, 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 (KrRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTb) = ∑ 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(Sb) * Weight(Sb) + 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 * 121.76 + 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 =
3592.3642 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgBaCdCeCsEuGdIInKrLaMoNbNdPdPmPrRbRhRuSbSmSnSrTbTcTeXeYZr

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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