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Molar Mass, Molecular Weight and Elemental Composition Calculator

Molar mass of (a)C2H2ClF3 is 118.4855 g/mol

Convert between (a)C2H2ClF3 weight and moles
CompoundMolesWeight, g
(a)C2H2ClF3

Elemental composition of (a)C2H2ClF3
ElementSymbolAtomic weightAtomsMass percent
CarbonC12.0107220.2737
HydrogenH1.0079421.7014
ChlorineCl35.453129.9218
FluorineF18.9984032348.1031

Computing molar mass step by step

First, compute the number of each atom in (a)C2H2ClF3:
C: 2, H: 2, Cl: 1, F: 3

Then, lookup atomic weights for each element in periodic table:
C: 12.0107, H: 1.00794, Cl: 35.453, F: 18.9984032

Now, compute the sum of products of number of atoms to the atomic weight:
Molar mass ((a)C2H2ClF3) = ∑ Counti * Weighti =
Count(C) * Weight(C) + Count(H) * Weight(H) + Count(Cl) * Weight(Cl) + Count(F) * Weight(F) =
2 * 12.0107 + 2 * 1.00794 + 1 * 35.453 + 3 * 18.9984032 =
118.4855 g/mol


Mass percent compositionAtomic percent composition

Related compounds
FormulaCompound name
CHClF2Chlorodifluoromethane
CH2ClFChlorofluoromethane
CHCl2FDichlorofluoromethane
C2HClF41-Chloro-1,2,2,2-tetrafluoroethane
C7H6ClF2-Chloro-6-fluorotoluene
C2HClF22-Chloro-1,1-difluoroethylene
C3H2ClF31-Chloro-3,3,3-trifluoropropene
C2Cl2F3H1,2-Dichloro-1,1,2-trifluoroethane
C2HCl2F32,2-Dichloro-1,1,1-trifluoroethane
C7H4ClF3Parachlorobenzotrifluoride

Formula in Hill system is C2H2ClF3

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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