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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of CHUIAsKAsWKURaWUIHOPICHUIUKURaWAsIErBAsCTsOgTlLiNaUUUUUUUHHe is 5945.0815 g/mol

Convert between CHUIAsKAsWKURaWUIHOPICHUIUKURaWAsIErBAsCTsOgTlLiNaUUUUUUUHHe weight and moles
CompoundMolesWeight, g
CHUIAsKAsWKURaWUIHOPICHUIUKURaWAsIErBAsCTsOgTlLiNaUUUUUUUHHe

Elemental composition of CHUIAsKAsWKURaWUIHOPICHUIUKURaWAsIErBAsCTsOgTlLiNaUUUUUUUHHe
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.010730.6061
HydrogenH1.0079440.0678
UraniumU238.028911352.0493
IodineI126.90447510.6731
ArsenicAs74.9216045.0409
PotassiumK39.098331.9730
TungstenW183.8439.2769
RadiumRa226.02541027.6038
OxygenO15.999410.2691
PhosphorusP30.97376210.5210
ErbiumEr167.25912.8134
BoronB10.81110.1818
TennessineTs292.20814.9151
OganessonOg0.000000010.0000
ThalliumTl204.383313.4379
LithiumLi6.94110.1168
SodiumNa22.9897692810.3867
HeliumHe4.00260210.0673

Computing molar mass step by step

First, compute the number of each atom in CHUIAsKAsWKURaWUIHOPICHUIUKURaWAsIErBAsCTsOgTlLiNaUUUUUUUHHe:
C: 3, H: 4, U: 13, I: 5, As: 4, K: 3, W: 3, Ra: 2, O: 1, P: 1, Er: 1, B: 1, Ts: 1, Og: 1, Tl: 1, Li: 1, Na: 1, He: 1

Then, lookup atomic weights for each element in periodic table:
C: 12.0107, H: 1.00794, U: 238.02891, I: 126.90447, As: 74.9216, K: 39.0983, W: 183.84, Ra: 226.0254098, O: 15.9994, P: 30.973762, Er: 167.259, B: 10.811, Ts: 292.20755, Og: 0, Tl: 204.3833, Li: 6.941, Na: 22.98976928, He: 4.002602

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass (CHUIAsKAsWKURaWUIHOPICHUIUKURaWAsIErBAsCTsOgTlLiNaUUUUUUUHHe) = ∑ Counti * Weighti =
Count(C) * Weight(C) + Count(H) * Weight(H) + Count(U) * Weight(U) + Count(I) * Weight(I) + Count(As) * Weight(As) + Count(K) * Weight(K) + Count(W) * Weight(W) + Count(Ra) * Weight(Ra) + Count(O) * Weight(O) + Count(P) * Weight(P) + Count(Er) * Weight(Er) + Count(B) * Weight(B) + Count(Ts) * Weight(Ts) + Count(Og) * Weight(Og) + Count(Tl) * Weight(Tl) + Count(Li) * Weight(Li) + Count(Na) * Weight(Na) + Count(He) * Weight(He) =
3 * 12.0107 + 4 * 1.00794 + 13 * 238.02891 + 5 * 126.90447 + 4 * 74.9216 + 3 * 39.0983 + 3 * 183.84 + 2 * 226.0254098 + 1 * 15.9994 + 1 * 30.973762 + 1 * 167.259 + 1 * 10.811 + 1 * 292.20755 + 1 * 0 + 1 * 204.3833 + 1 * 6.941 + 1 * 22.98976928 + 1 * 4.002602 =
5945.0815 g/mol


Mass percent compositionAtomic percent composition

Formula in Hill system is C3H4As4BErHeI5K3LiNaOOgPRa2TlTsU13W3

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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