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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of AlH3O3MnF7CCl4PSiNaMg10OsHgBBrIYZrUPoPrPaAmEsFmMdWTaTlCuZnPt is 4253.8909 g/mol

Convert between AlH3O3MnF7CCl4PSiNaMg10OsHgBBrIYZrUPoPrPaAmEsFmMdWTaTlCuZnPt weight and moles
CompoundMolesWeight, g
AlH3O3MnF7CCl4PSiNaMg10OsHgBBrIYZrUPoPrPaAmEsFmMdWTaTlCuZnPt

Elemental composition of AlH3O3MnF7CCl4PSiNaMg10OsHgBBrIYZrUPoPrPaAmEsFmMdWTaTlCuZnPt
ElementSymbolAtomic weightAtomsMass percent
AluminumAl26.981538610.6343
HydrogenH1.0079430.0711
OxygenO15.999431.1283
ManganeseMn54.93804511.2915
FluorineF18.998403273.1263
CarbonC12.010710.2823
ChlorineCl35.45343.3337
PhosphorusP30.97376210.7281
SiliconSi28.085510.6602
SodiumNa22.9897692810.5404
MagnesiumMg24.3050105.7136
OsmiumOs190.2314.4719
MercuryHg200.5914.7154
BoronB10.81110.2541
BromineBr79.90411.8784
IodineI126.9044712.9833
YttriumY88.9058512.0900
ZirconiumZr91.22412.1445
UraniumU238.0289115.5956
PoloniumPo208.98243014.9127
PraseodymiumPr140.9076513.3124
ProtactiniumPa231.0358815.4312
AmericiumAm241.05682915.6667
EinsteiniumEs252.0829815.9259
FermiumFm257.09510516.0438
MendeleviumMd258.09843116.0673
TungstenW183.8414.3217
TantalumTa180.9478814.2537
ThalliumTl204.383314.8046
CopperCu63.54611.4938
ZincZn65.3811.5369
PlatinumPt195.08414.5860

Computing molar mass step by step

First, compute the number of each atom in AlH3O3MnF7CCl4PSiNaMg10OsHgBBrIYZrUPoPrPaAmEsFmMdWTaTlCuZnPt:
Al: 1, H: 3, O: 3, Mn: 1, F: 7, C: 1, Cl: 4, P: 1, Si: 1, Na: 1, Mg: 10, Os: 1, Hg: 1, B: 1, Br: 1, I: 1, Y: 1, Zr: 1, U: 1, Po: 1, Pr: 1, Pa: 1, Am: 1, Es: 1, Fm: 1, Md: 1, W: 1, Ta: 1, Tl: 1, Cu: 1, Zn: 1, Pt: 1

Then, lookup atomic weights for each element in periodic table:
Al: 26.9815386, H: 1.00794, O: 15.9994, Mn: 54.938045, F: 18.9984032, C: 12.0107, Cl: 35.453, P: 30.973762, Si: 28.0855, Na: 22.98976928, Mg: 24.305, Os: 190.23, Hg: 200.59, B: 10.811, Br: 79.904, I: 126.90447, Y: 88.90585, Zr: 91.224, U: 238.02891, Po: 208.9824304, Pr: 140.90765, Pa: 231.03588, Am: 241.0568291, Es: 252.08298, Fm: 257.095105, Md: 258.098431, W: 183.84, Ta: 180.94788, Tl: 204.3833, Cu: 63.546, Zn: 65.38, Pt: 195.084

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (AlH3O3MnF7CCl4PSiNaMg10OsHgBBrIYZrUPoPrPaAmEsFmMdWTaTlCuZnPt) = ∑ Counti * Weighti =
Count(Al) * Weight(Al) + Count(H) * Weight(H) + Count(O) * Weight(O) + Count(Mn) * Weight(Mn) + Count(F) * Weight(F) + Count(C) * Weight(C) + Count(Cl) * Weight(Cl) + Count(P) * Weight(P) + Count(Si) * Weight(Si) + Count(Na) * Weight(Na) + Count(Mg) * Weight(Mg) + Count(Os) * Weight(Os) + Count(Hg) * Weight(Hg) + Count(B) * Weight(B) + Count(Br) * Weight(Br) + Count(I) * Weight(I) + Count(Y) * Weight(Y) + Count(Zr) * Weight(Zr) + Count(U) * Weight(U) + Count(Po) * Weight(Po) + Count(Pr) * Weight(Pr) + Count(Pa) * Weight(Pa) + Count(Am) * Weight(Am) + Count(Es) * Weight(Es) + Count(Fm) * Weight(Fm) + Count(Md) * Weight(Md) + Count(W) * Weight(W) + Count(Ta) * Weight(Ta) + Count(Tl) * Weight(Tl) + Count(Cu) * Weight(Cu) + Count(Zn) * Weight(Zn) + Count(Pt) * Weight(Pt) =
1 * 26.9815386 + 3 * 1.00794 + 3 * 15.9994 + 1 * 54.938045 + 7 * 18.9984032 + 1 * 12.0107 + 4 * 35.453 + 1 * 30.973762 + 1 * 28.0855 + 1 * 22.98976928 + 10 * 24.305 + 1 * 190.23 + 1 * 200.59 + 1 * 10.811 + 1 * 79.904 + 1 * 126.90447 + 1 * 88.90585 + 1 * 91.224 + 1 * 238.02891 + 1 * 208.9824304 + 1 * 140.90765 + 1 * 231.03588 + 1 * 241.0568291 + 1 * 252.08298 + 1 * 257.095105 + 1 * 258.098431 + 1 * 183.84 + 1 * 180.94788 + 1 * 204.3833 + 1 * 63.546 + 1 * 65.38 + 1 * 195.084 =
4253.8909 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CH3AlAmBBrCl4CuEsF7FmHgIMdMg10MnNaO3OsPPaPoPrPtSiTaTlUWYZnZr

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, 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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