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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of HBCNOFKPSVYIWUZrNbMoTcRuRhPdAgCdHeNeArKrXeRnLiNaRbCsFrBeMgCa is 2806.1942 g/mol

Convert between HBCNOFKPSVYIWUZrNbMoTcRuRhPdAgCdHeNeArKrXeRnLiNaRbCsFrBeMgCa weight and moles
CompoundMolesWeight, g
HBCNOFKPSVYIWUZrNbMoTcRuRhPdAgCdHeNeArKrXeRnLiNaRbCsFrBeMgCa

Elemental composition of HBCNOFKPSVYIWUZrNbMoTcRuRhPdAgCdHeNeArKrXeRnLiNaRbCsFrBeMgCa
ElementSymbolAtomic weightAtomsMass percent
HydrogenH1.0079410.0359
BoronB10.81110.3853
CarbonC12.010710.4280
NitrogenN14.006710.4991
OxygenO15.999410.5701
FluorineF18.998403210.6770
PotassiumK39.098311.3933
PhosphorusP30.97376211.1038
SulfurS32.06511.1427
VanadiumV50.941511.8153
YttriumY88.9058513.1682
IodineI126.9044714.5223
TungstenW183.8416.5512
UraniumU238.0289118.4823
ZirconiumZr91.22413.2508
NiobiumNb92.9063813.3108
MolybdenumMo95.9613.4196
TechnetiumTc96.90636513.4533
RutheniumRu101.0713.6017
RhodiumRh102.9055013.6671
PalladiumPd106.4213.7923
SilverAg107.868213.8439
CadmiumCd112.41114.0058
HeliumHe4.00260210.1426
NeonNe20.179710.7191
ArgonAr39.94811.4236
KryptonKr83.79812.9862
XenonXe131.29314.6787
RadonRn210.99060117.5187
LithiumLi6.94110.2473
SodiumNa22.9897692810.8193
RubidiumRb85.467813.0457
CesiumCs132.905451914.7361
FranciumFr223.01973617.9474
BerylliumBe9.01218210.3212
MagnesiumMg24.305010.8661
CalciumCa40.07811.4282

Computing molar mass step by step

First, compute the number of each atom in HBCNOFKPSVYIWUZrNbMoTcRuRhPdAgCdHeNeArKrXeRnLiNaRbCsFrBeMgCa:
H: 1, B: 1, C: 1, N: 1, O: 1, F: 1, K: 1, P: 1, S: 1, V: 1, Y: 1, I: 1, W: 1, U: 1, Zr: 1, Nb: 1, Mo: 1, Tc: 1, Ru: 1, Rh: 1, Pd: 1, Ag: 1, Cd: 1, He: 1, Ne: 1, Ar: 1, Kr: 1, Xe: 1, Rn: 1, Li: 1, Na: 1, Rb: 1, Cs: 1, Fr: 1, Be: 1, Mg: 1, Ca: 1

Then, lookup atomic weights for each element in periodic table:
H: 1.00794, B: 10.811, C: 12.0107, N: 14.0067, O: 15.9994, F: 18.9984032, K: 39.0983, P: 30.973762, S: 32.065, V: 50.9415, Y: 88.90585, I: 126.90447, W: 183.84, U: 238.02891, Zr: 91.224, Nb: 92.90638, Mo: 95.96, Tc: 96.906365, Ru: 101.07, Rh: 102.9055, Pd: 106.42, Ag: 107.8682, Cd: 112.411, He: 4.002602, Ne: 20.1797, Ar: 39.948, Kr: 83.798, Xe: 131.293, Rn: 210.990601, Li: 6.941, Na: 22.98976928, Rb: 85.4678, Cs: 132.9054519, Fr: 223.0197359, Be: 9.012182, Mg: 24.305, Ca: 40.078

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (HBCNOFKPSVYIWUZrNbMoTcRuRhPdAgCdHeNeArKrXeRnLiNaRbCsFrBeMgCa) = ∑ Counti * Weighti =
Count(H) * Weight(H) + Count(B) * Weight(B) + Count(C) * Weight(C) + Count(N) * Weight(N) + Count(O) * Weight(O) + Count(F) * Weight(F) + Count(K) * Weight(K) + Count(P) * Weight(P) + Count(S) * Weight(S) + Count(V) * Weight(V) + Count(Y) * Weight(Y) + Count(I) * Weight(I) + Count(W) * Weight(W) + Count(U) * Weight(U) + Count(Zr) * Weight(Zr) + Count(Nb) * Weight(Nb) + Count(Mo) * Weight(Mo) + Count(Tc) * Weight(Tc) + Count(Ru) * Weight(Ru) + Count(Rh) * Weight(Rh) + Count(Pd) * Weight(Pd) + Count(Ag) * Weight(Ag) + Count(Cd) * Weight(Cd) + Count(He) * Weight(He) + Count(Ne) * Weight(Ne) + Count(Ar) * Weight(Ar) + Count(Kr) * Weight(Kr) + Count(Xe) * Weight(Xe) + Count(Rn) * Weight(Rn) + Count(Li) * Weight(Li) + Count(Na) * Weight(Na) + Count(Rb) * Weight(Rb) + Count(Cs) * Weight(Cs) + Count(Fr) * Weight(Fr) + Count(Be) * Weight(Be) + Count(Mg) * Weight(Mg) + Count(Ca) * Weight(Ca) =
1 * 1.00794 + 1 * 10.811 + 1 * 12.0107 + 1 * 14.0067 + 1 * 15.9994 + 1 * 18.9984032 + 1 * 39.0983 + 1 * 30.973762 + 1 * 32.065 + 1 * 50.9415 + 1 * 88.90585 + 1 * 126.90447 + 1 * 183.84 + 1 * 238.02891 + 1 * 91.224 + 1 * 92.90638 + 1 * 95.96 + 1 * 96.906365 + 1 * 101.07 + 1 * 102.9055 + 1 * 106.42 + 1 * 107.8682 + 1 * 112.411 + 1 * 4.002602 + 1 * 20.1797 + 1 * 39.948 + 1 * 83.798 + 1 * 131.293 + 1 * 210.990601 + 1 * 6.941 + 1 * 22.98976928 + 1 * 85.4678 + 1 * 132.9054519 + 1 * 223.0197359 + 1 * 9.012182 + 1 * 24.305 + 1 * 40.078 =
2806.1942 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is CHAgArBBeCaCdCsFFrHeIKKrLiMgMoNNaNbNeOPPdRbRhRnRuSTcUVWXeYZr

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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