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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLrBLaAcPaSnSbClBrIYAtAs is 4235.5166 g/mol

Convert between CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLrBLaAcPaSnSbClBrIYAtAs weight and moles
CompoundMolesWeight, g
CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLrBLaAcPaSnSbClBrIYAtAs

Elemental composition of CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLrBLaAcPaSnSbClBrIYAtAs
ElementSymbolAtomic weightAtomsMass percent
CopperCu63.54611.5003
IronFe55.84511.3185
TechnetiumTc96.90636512.2879
RheniumRe186.20728.7926
RhodiumRh102.9055012.4296
PalladiumPd106.4212.5126
SilverAg107.868212.5468
TungstenW183.8414.3404
OsmiumOs190.2314.4913
IridiumIr192.21714.5382
PlatinumPt195.08414.6059
GoldAu196.96656914.6504
MercuryHg200.5914.7359
OxygenO15.999410.3777
SulfurS32.06510.7571
PhosphorusP30.97376210.7313
PotassiumK39.098310.9231
UraniumU238.0289115.6198
HydrogenH1.00794180.4284
FluorineF18.998403210.4485
VanadiumV50.941511.2027
LawrenciumLr262.109616.1884
BoronB10.81110.2552
LanthanumLa138.9054713.2795
ActiniumAc227.02775215.3601
ProtactiniumPa231.0358815.4547
TinSn118.71012.8027
AntimonySb121.76012.8747
ChlorineCl35.45310.8370
BromineBr79.90411.8865
IodineI126.9044712.9962
YttriumY88.9058512.0991
AstatineAt209.98714814.9578
ArsenicAs74.9216011.7689

Computing molar mass step by step

First, compute the number of each atom in CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLrBLaAcPaSnSbClBrIYAtAs:
Cu: 1, Fe: 1, Tc: 1, Re: 2, Rh: 1, Pd: 1, Ag: 1, W: 1, Os: 1, Ir: 1, Pt: 1, Au: 1, Hg: 1, O: 1, S: 1, P: 1, K: 1, U: 1, H: 18, F: 1, V: 1, Lr: 1, B: 1, La: 1, Ac: 1, Pa: 1, Sn: 1, Sb: 1, Cl: 1, Br: 1, I: 1, Y: 1, At: 1, As: 1

Then, lookup atomic weights for each element in periodic table:
Cu: 63.546, Fe: 55.845, Tc: 96.906365, Re: 186.207, Rh: 102.9055, Pd: 106.42, Ag: 107.8682, W: 183.84, Os: 190.23, Ir: 192.217, Pt: 195.084, Au: 196.966569, Hg: 200.59, O: 15.9994, S: 32.065, P: 30.973762, K: 39.0983, U: 238.02891, H: 1.00794, F: 18.9984032, V: 50.9415, Lr: 262.10963, B: 10.811, La: 138.90547, Ac: 227.0277521, Pa: 231.03588, Sn: 118.71, Sb: 121.76, Cl: 35.453, Br: 79.904, I: 126.90447, Y: 88.90585, At: 209.987148, As: 74.9216

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLrBLaAcPaSnSbClBrIYAtAs) = ∑ Counti * Weighti =
Count(Cu) * Weight(Cu) + Count(Fe) * Weight(Fe) + Count(Tc) * Weight(Tc) + Count(Re) * Weight(Re) + Count(Rh) * Weight(Rh) + Count(Pd) * Weight(Pd) + Count(Ag) * Weight(Ag) + Count(W) * Weight(W) + Count(Os) * Weight(Os) + Count(Ir) * Weight(Ir) + Count(Pt) * Weight(Pt) + Count(Au) * Weight(Au) + Count(Hg) * Weight(Hg) + Count(O) * Weight(O) + Count(S) * Weight(S) + Count(P) * Weight(P) + Count(K) * Weight(K) + Count(U) * Weight(U) + Count(H) * Weight(H) + Count(F) * Weight(F) + Count(V) * Weight(V) + Count(Lr) * Weight(Lr) + Count(B) * Weight(B) + Count(La) * Weight(La) + Count(Ac) * Weight(Ac) + Count(Pa) * Weight(Pa) + Count(Sn) * Weight(Sn) + Count(Sb) * Weight(Sb) + Count(Cl) * Weight(Cl) + Count(Br) * Weight(Br) + Count(I) * Weight(I) + Count(Y) * Weight(Y) + Count(At) * Weight(At) + Count(As) * Weight(As) =
1 * 63.546 + 1 * 55.845 + 1 * 96.906365 + 2 * 186.207 + 1 * 102.9055 + 1 * 106.42 + 1 * 107.8682 + 1 * 183.84 + 1 * 190.23 + 1 * 192.217 + 1 * 195.084 + 1 * 196.966569 + 1 * 200.59 + 1 * 15.9994 + 1 * 32.065 + 1 * 30.973762 + 1 * 39.0983 + 1 * 238.02891 + 18 * 1.00794 + 1 * 18.9984032 + 1 * 50.9415 + 1 * 262.10963 + 1 * 10.811 + 1 * 138.90547 + 1 * 227.0277521 + 1 * 231.03588 + 1 * 118.71 + 1 * 121.76 + 1 * 35.453 + 1 * 79.904 + 1 * 126.90447 + 1 * 88.90585 + 1 * 209.987148 + 1 * 74.9216 =
4235.5166 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAgAsAtAuBBrClCuFFeH18HgIIrKLaLrOOsPPaPdPtRe2RhSSbSnTcUVWY

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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