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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of F3Te3H37Hg2Mg3I2K3W3Rb3Xe3S2B3N3Y6Fr2V3OsAl2Li5He25Cr2YbZn2 is 4581.7417 g/mol

Convert between F3Te3H37Hg2Mg3I2K3W3Rb3Xe3S2B3N3Y6Fr2V3OsAl2Li5He25Cr2YbZn2 weight and moles
CompoundMolesWeight, g
F3Te3H37Hg2Mg3I2K3W3Rb3Xe3S2B3N3Y6Fr2V3OsAl2Li5He25Cr2YbZn2

Elemental composition of F3Te3H37Hg2Mg3I2K3W3Rb3Xe3S2B3N3Y6Fr2V3OsAl2Li5He25Cr2YbZn2
ElementSymbolAtomic weightAtomsMass percent
FluorineF18.998403231.2440
TelluriumTe127.6038.3549
HydrogenH1.00794370.8140
MercuryHg200.5928.7561
MagnesiumMg24.305031.5914
IodineI126.9044725.5396
PotassiumK39.098332.5601
TungstenW183.84312.0373
RubidiumRb85.467835.5962
XenonXe131.29338.5967
SulfurS32.06521.3997
BoronB10.81130.7079
NitrogenN14.006730.9171
YttriumY88.90585611.6426
FranciumFr223.01973629.7352
VanadiumV50.941533.3355
OsmiumOs190.2314.1519
AluminumAl26.981538621.1778
LithiumLi6.94150.7575
HeliumHe4.002602252.1840
ChromiumCr51.996122.2697
YtterbiumYb173.05413.7770
ZincZn65.3822.8539

Computing molar mass step by step

First, compute the number of each atom in F3Te3H37Hg2Mg3I2K3W3Rb3Xe3S2B3N3Y6Fr2V3OsAl2Li5He25Cr2YbZn2:
F: 3, Te: 3, H: 37, Hg: 2, Mg: 3, I: 2, K: 3, W: 3, Rb: 3, Xe: 3, S: 2, B: 3, N: 3, Y: 6, Fr: 2, V: 3, Os: 1, Al: 2, Li: 5, He: 25, Cr: 2, Yb: 1, Zn: 2

Then, lookup atomic weights for each element in periodic table:
F: 18.9984032, Te: 127.6, H: 1.00794, Hg: 200.59, Mg: 24.305, I: 126.90447, K: 39.0983, W: 183.84, Rb: 85.4678, Xe: 131.293, S: 32.065, B: 10.811, N: 14.0067, Y: 88.90585, Fr: 223.0197359, V: 50.9415, Os: 190.23, Al: 26.9815386, Li: 6.941, He: 4.002602, Cr: 51.9961, Yb: 173.054, Zn: 65.38

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (F3Te3H37Hg2Mg3I2K3W3Rb3Xe3S2B3N3Y6Fr2V3OsAl2Li5He25Cr2YbZn2) = ∑ Counti * Weighti =
Count(F) * Weight(F) + Count(Te) * Weight(Te) + Count(H) * Weight(H) + Count(Hg) * Weight(Hg) + Count(Mg) * Weight(Mg) + Count(I) * Weight(I) + Count(K) * Weight(K) + Count(W) * Weight(W) + Count(Rb) * Weight(Rb) + Count(Xe) * Weight(Xe) + Count(S) * Weight(S) + Count(B) * Weight(B) + Count(N) * Weight(N) + Count(Y) * Weight(Y) + Count(Fr) * Weight(Fr) + Count(V) * Weight(V) + Count(Os) * Weight(Os) + Count(Al) * Weight(Al) + Count(Li) * Weight(Li) + Count(He) * Weight(He) + Count(Cr) * Weight(Cr) + Count(Yb) * Weight(Yb) + Count(Zn) * Weight(Zn) =
3 * 18.9984032 + 3 * 127.6 + 37 * 1.00794 + 2 * 200.59 + 3 * 24.305 + 2 * 126.90447 + 3 * 39.0983 + 3 * 183.84 + 3 * 85.4678 + 3 * 131.293 + 2 * 32.065 + 3 * 10.811 + 3 * 14.0067 + 6 * 88.90585 + 2 * 223.0197359 + 3 * 50.9415 + 1 * 190.23 + 2 * 26.9815386 + 5 * 6.941 + 25 * 4.002602 + 2 * 51.9961 + 1 * 173.054 + 2 * 65.38 =
4581.7417 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is Al2B3Cr2F3Fr2H37He25Hg2I2K3Li5Mg3N3OsRb3S2Te3V3W3Xe3Y6YbZn2

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

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