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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HHeLiBeBOPFKMgMnRnRaUNNeNpPtAgAuMgFrLuTh30TeTa is 9353.2655 g/mol

Convert between HHeLiBeBOPFKMgMnRnRaUNNeNpPtAgAuMgFrLuTh30TeTa weight and moles
CompoundMolesWeight, g
HHeLiBeBOPFKMgMnRnRaUNNeNpPtAgAuMgFrLuTh30TeTa

Elemental composition of HHeLiBeBOPFKMgMnRnRaUNNeNpPtAgAuMgFrLuTh30TeTa
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0108
HeliumHe4.00260210.0428
LithiumLi6.94110.0742
BerylliumBe9.01218210.0964
BoronB10.81110.1156
OxygenO15.999410.1711
PhosphorusP30.97376210.3312
FluorineF18.998403210.2031
PotassiumK39.098310.4180
MagnesiumMg24.305020.5197
ManganeseMn54.93804510.5874
RadonRn210.99060112.2558
RadiumRa226.02541012.4165
UraniumU238.0289112.5449
NitrogenN14.006710.1498
NeonNe20.179710.2158
NeptuniumNp236.0465712.5237
PlatinumPt195.08412.0857
SilverAg107.868211.1533
GoldAu196.96656912.1059
FranciumFr223.01973612.3844
LutetiumLu174.966811.8706
ThoriumTh232.038063074.4247
TelluriumTe127.6011.3642
TantalumTa180.9478811.9346

Computing molar mass step by step

First, compute the number of each atom in HHeLiBeBOPFKMgMnRnRaUNNeNpPtAgAuMgFrLuTh30TeTa:
H: 1, He: 1, Li: 1, Be: 1, B: 1, O: 1, P: 1, F: 1, K: 1, Mg: 2, Mn: 1, Rn: 1, Ra: 1, U: 1, N: 1, Ne: 1, Np: 1, Pt: 1, Ag: 1, Au: 1, Fr: 1, Lu: 1, Th: 30, Te: 1, Ta: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, He: 4.002602, Li: 6.941, Be: 9.012182, B: 10.811, O: 15.9994, P: 30.973762, F: 18.9984032, K: 39.0983, Mg: 24.305, Mn: 54.938045, Rn: 210.990601, Ra: 226.0254098, U: 238.02891, N: 14.0067, Ne: 20.1797, Np: 236.04657, Pt: 195.084, Ag: 107.8682, Au: 196.966569, Fr: 223.0197359, Lu: 174.9668, Th: 232.03806, Te: 127.6, Ta: 180.94788

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HHeLiBeBOPFKMgMnRnRaUNNeNpPtAgAuMgFrLuTh30TeTa) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(He) * Weight(He) + Count(Li) * Weight(Li) + Count(Be) * Weight(Be) + Count(B) * Weight(B) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(F) * Weight(F) + Count(K) * Weight(K) + Count(Mg) * Weight(Mg) + Count(Mn) * Weight(Mn) + Count(Rn) * Weight(Rn) + Count(Ra) * Weight(Ra) + Count(U) * Weight(U) + Count(N) * Weight(N) + Count(Ne) * Weight(Ne) + Count(Np) * Weight(Np) + Count(Pt) * Weight(Pt) + Count(Ag) * Weight(Ag) + Count(Au) * Weight(Au) + Count(Fr) * Weight(Fr) + Count(Lu) * Weight(Lu) + Count(Th) * Weight(Th) + Count(Te) * Weight(Te) + Count(Ta) * Weight(Ta) =
1 * 1.00794 + 1 * 4.002602 + 1 * 6.941 + 1 * 9.012182 + 1 * 10.811 + 1 * 15.9994 + 1 * 30.973762 + 1 * 18.9984032 + 1 * 39.0983 + 2 * 24.305 + 1 * 54.938045 + 1 * 210.990601 + 1 * 226.0254098 + 1 * 238.02891 + 1 * 14.0067 + 1 * 20.1797 + 1 * 236.04657 + 1 * 195.084 + 1 * 107.8682 + 1 * 196.966569 + 1 * 223.0197359 + 1 * 174.9668 + 30 * 232.03806 + 1 * 127.6 + 1 * 180.94788 =
9353.2655 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is AgAuBBeFFrHHeKLiLuMg2MnNNeNpOPPtRaRnTaTeTh30U

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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