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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of KRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTbDy is 3710.1645 g/mol

Convert between KRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTbDy weight and moles
CompoundMolesWeight, g
KRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTbDy

Elemental composition of KRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTbDy
ElementSymbolAtomic weightAtomsMass percent
PotassiumK39.098311.0538
RubidiumRb85.467812.3036
StrontiumSr87.6212.3616
YttriumY88.9058512.3963
ZirconiumZr91.22412.4588
NiobiumNb92.9063812.5041
MolybdenumMo95.9612.5864
TechnetiumTc96.90636512.6119
RutheniumRu101.0712.7241
RhodiumRh102.9055012.7736
PalladiumPd106.4212.8683
SilverAg107.868212.9074
CadmiumCd112.41113.0298
IndiumIn114.81813.0947
TinSn118.71013.1996
AntimonySb121.76013.2818
TelluriumTe127.6013.4392
IodineI126.9044713.4205
XenonXe131.29313.5387
CesiumCs132.905451913.5822
BariumBa137.32713.7014
LanthanumLa138.9054713.7439
CeriumCe140.11613.7765
PraseodymiumPr140.9076513.7979
NeodymiumNd144.24213.8878
PromethiumPm144.91274913.9058
SamariumSm150.3614.0527
EuropiumEu151.96414.0959
GadoliniumGd157.2514.2384
TerbiumTb158.9253514.2835
DysprosiumDy162.50014.3799

Computing molar mass step by step

First, compute the number of each atom in KRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTbDy:
K: 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, Dy: 1

Then, lookup atomic weights for each element in periodic table:
K: 39.0983, 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, Dy: 162.5

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (KRbSrYZrNbMoTcRuRhPdAgCdInSnSbTeIXeCsBaLaCePrNdPmSmEuGdTbDy) = ∑ Counti * Weighti =
Count(K) * Weight(K) + 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) + Count(Dy) * Weight(Dy) =
1 * 39.0983 + 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 + 1 * 162.5 =
3710.1645 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgBaCdCeCsDyEuGdIInKLaMoNbNdPdPmPrRbRhRuSbSmSnSrTbTcTeXeYZr

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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