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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLuLaAcPaSnSbClBrIYAtAs is 4137.5628 g/mol

Convert between CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLuLaAcPaSnSbClBrIYAtAs weight and moles
CompoundMolesWeight, g
CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLuLaAcPaSnSbClBrIYAtAs

Elemental composition of CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLuLaAcPaSnSbClBrIYAtAs
ElementSymbolAtomic weightAtomsMass percent
CopperCu63.54611.5358
IronFe55.84511.3497
TechnetiumTc96.90636512.3421
RheniumRe186.20729.0008
RhodiumRh102.9055012.4871
PalladiumPd106.4212.5720
SilverAg107.868212.6070
TungstenW183.8414.4432
OsmiumOs190.2314.5976
IridiumIr192.21714.6457
PlatinumPt195.08414.7149
GoldAu196.96656914.7604
MercuryHg200.5914.8480
OxygenO15.999410.3867
SulfurS32.06510.7750
PhosphorusP30.97376210.7486
PotassiumK39.098310.9450
UraniumU238.0289115.7529
HydrogenH1.00794180.4385
FluorineF18.998403210.4592
VanadiumV50.941511.2312
LutetiumLu174.966814.2287
LanthanumLa138.9054713.3572
ActiniumAc227.02775215.4870
ProtactiniumPa231.0358815.5839
TinSn118.71012.8691
AntimonySb121.76012.9428
ChlorineCl35.45310.8569
BromineBr79.90411.9312
IodineI126.9044713.0671
YttriumY88.9058512.1487
AstatineAt209.98714815.0751
ArsenicAs74.9216011.8108

Computing molar mass step by step

First, compute the number of each atom in CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLuLaAcPaSnSbClBrIYAtAs:
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, Lu: 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, Lu: 174.9668, 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 (CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUH18FVLuLaAcPaSnSbClBrIYAtAs) = ∑ 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(Lu) * Weight(Lu) + 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 * 174.9668 + 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 =
4137.5628 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAgAsAtAuBrClCuFFeH18HgIIrKLaLuOOsPPaPdPtRe2RhSSbSnTcUVWY

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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