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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUFVCn999BLaAcPaSnSbClBrIYAtAs is 288844.2000 g/mol

Convert between CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUFVCn999BLaAcPaSnSbClBrIYAtAs weight and moles
CompoundMolesWeight, g
CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUFVCn999BLaAcPaSnSbClBrIYAtAs

Elemental composition of CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUFVCn999BLaAcPaSnSbClBrIYAtAs
ElementSymbolAtomic weightAtomsMass percent
CopperCu63.54610.0220
IronFe55.84510.0193
TechnetiumTc96.90636510.0335
RheniumRe186.20720.1289
RhodiumRh102.9055010.0356
PalladiumPd106.4210.0368
SilverAg107.868210.0373
TungstenW183.8410.0636
OsmiumOs190.2310.0659
IridiumIr192.21710.0665
PlatinumPt195.08410.0675
GoldAu196.96656910.0682
MercuryHg200.5910.0694
OxygenO15.999410.0055
SulfurS32.06510.0111
PhosphorusP30.97376210.0107
PotassiumK39.098310.0135
UraniumU238.0289110.0824
FluorineF18.998403210.0066
VanadiumV50.941510.0176
CoperniciumCn285.174199998.6307
BoronB10.81110.0037
LanthanumLa138.9054710.0481
ActiniumAc227.02775210.0786
ProtactiniumPa231.0358810.0800
TinSn118.71010.0411
AntimonySb121.76010.0422
ChlorineCl35.45310.0123
BromineBr79.90410.0277
IodineI126.9044710.0439
YttriumY88.9058510.0308
AstatineAt209.98714810.0727
ArsenicAs74.9216010.0259

Computing molar mass step by step

First, compute the number of each atom in CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUFVCn999BLaAcPaSnSbClBrIYAtAs:
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, F: 1, V: 1, Cn: 999, 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, F: 18.9984032, V: 50.9415, Cn: 285.17411, 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 (CuFeTcReRhPdAgWReOsIrPtAuHgOSPKUFVCn999BLaAcPaSnSbClBrIYAtAs) = ∑ 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(F) * Weight(F) + Count(V) * Weight(V) + Count(Cn) * Weight(Cn) + 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 + 1 * 18.9984032 + 1 * 50.9415 + 999 * 285.17411 + 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 =
288844.2000 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AcAgAsAtAuBBrClCn999CuFFeHgIIrKLaOOsPPaPdPtRe2RhSSbSnTcUVWY

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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