First, compute the number of each atom in C2H5COOCH3:
C: 4, H: 8, O: 2
Then, lookup atomic weights for each element in periodic table:
C: 12.0107, H: 1.00794, O: 15.9994
Now, compute the sum of products of number of atoms đồ sộ the atomic weight:
Molar mass (C2H5COOCH3) = ∑ Counti * Weighti =
Count(C) * Weight(C) + Count(H) * Weight(H) + Count(O) * Weight(O) =
4 * 12.0107 + 8 * 1.00794 + 2 * 15.9994 =
Mass percent composition
Atomic percent composition
Formula in Hill system is C4H8O2
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, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg
parantesis () or brackets .
Common compound names.
Examples of molar mass computations:
Molar mass calculator also displays common compound name, Hill formula, elemental composition, mass percent composition, atomic percent compositions and allows đồ sộ convert from weight đồ sộ 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:
Definitions of molecular mass, molecular weight, molar mass and molar weight
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 đồ sộ 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.
Weights of atoms and isotopes are from NIST article.
Related: Molecular weights of amino acids
molecular weights calculated today
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