molecular formula


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formula

 [for´mu-lah] (pl. formulas, for´mulae) (L.)
1. an expression, using numbers or symbols, giving the directions for preparing a compound (such as a medicine) or giving a procedure to follow to obtain a desired result.
2. a mixture for feeding an infant, usually with cow's milk as a base, supplemented with vitamins and minerals. Various formulas are available, differing in protein, fat, and carbohydrate content in order to meet the nutritional requirements or restrictions of individual infants.
chemical formula a combination of symbols used to express the chemical components of a substance.
empirical formula a chemical formula that expresses the proportions of the elements present in a substance.
molecular formula a chemical formula expressing the number of each element present in a substance, without indicating how they are linked.
spatial formula (stereochemical formula) a chemical formula giving the numbers of atoms of each element present in a molecule of a substance, which atom is linked to which, the types of linkages involved, and the relative positions of the atoms in space.
structural formula a chemical formula showing the spatial arrangement of the atoms and the linkage of every atom.

em·pir·ic for·mu·la

in chemistry, a formula indicating the kind and number of atoms in the molecules of a substance, or its composition, but not the relation of the atoms to each other or the intimate structure of the molecule.
Synonym(s): molecular formula

molecular formula,

n a representation of the numbers of all elements that comprise one molecule of a compound.

formula

pl. formulae, formulas [L.] an expression, using numbers or symbols, of the composition of, or of directions for preparing, a compound, such as a medicine, or of a procedure to follow to obtain a desired result, or of a single concept.

chemical formula
a combination of symbols used to express the chemical components of a substance.
dental formula
see dental formula.
empirical formula
a chemical formula that expresses the proportions of the elements present in a substance.
gait formula
sets out the times that the feet are individually in contact with the ground while the animal is moving.
molecular formula
a chemical formula expressing the number of atoms of each element present in a substance, without indicating how they are linked.
spatial formula, stereochemical formula
a chemical formula giving the numbers of atoms of each element present in a molecule of a substance, which atom is linked to which, the types of linkages involved, and the relative positions of the atoms in space.
structural formula
a chemical formula showing the spatial arrangement of the atoms and the linkage of every atom.
vertebral formula
sets out the number of vertebrae in each of the sections of the spinal column.
References in periodicals archive ?
The mass spectra showed the molecular ion peak at m/z (318) which is in agreement with its molecular formula ([C.
0, CHCl3) having molecular formula C29H50O3, based on HREIMS m/z 446.
GMF processing of the valinomycin spectrum indicated that the correct molecular formula was chosen and that the GMF tool correctly determined that the molecule at m/z 1133 was sodiated.
Table 1: Molecular formula and Practical yield of synthesized compounds.
The 'molecular weight calculator' allows you to enter the molecular formula of a compound, and keeps a running total of grow.
Searchable supporting data will include biological activity, molecular formula, compound class, author names and addresses, article title, and author abstract.
1280 consistent with the molecular formula C30H24O12 bearing nineteen double bond equivalence (DBE).
Entries include Chemical Abstract Service (CAS) registry numbers, and are arranged by increasing molecular formula from C15H5O5 to C60H93O6.
Most spectra are accompanied by the structure and trivial name, molecular formula, molecular weight, nominal mass, and base peak.
9, with molecular formula C41H81NO5 and M+ at m/z 667.

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