An expression representing the composition of elements in a chemical substance, commonly consisting of a series of letters and numbers comprising the atomic symbols of each element present in a compound followed by the number of atoms of that element present in one molecule of the substance. Thus the molecular formula for common alcohol (ethyl alcohol) is C2H6O, meaning that each molecule contains two carbon atoms, six hydrogen atoms, and one oxygen atom. The molecular formula may be written to provide some indication of the actual structure of the molecule, in which case structural units may be written separately. Thus, ethyl alcohol can also be written as CH3.CH2.OH or CH3-CH2-OH, in which the period or dash between functional groups indicates a single bond between the principle atoms of each group. This formula shows that in ethyl alcohol, the carbon of a methyl group (CH3-) is attached to the carbon of a methylene group (-CH2-), which is attached to the oxygen of a hydroxyl group (-OH). A structural formula is a graphical depiction of the relative positions of atoms in a molecule, and may be very complicated.
chemical formula that gives the composition of one molecule
The number and types of atom in a molecule. For example the molecular formula of methane is CH4, one atom of carbon and four atoms of hydrogen.
formula; chemical formula. Compare with empirical formula. A notation that indicates the type and number of atoms in a molecule. The molecular formula of glucose is C6H12O6, which indicates that a molecule of glucose contains 6 atoms of carbon, 12 atoms of hydrogen, and 6 atoms of oxygen.
a chemical formula based on analysis and molecular weight
a chemical formula that gives the exact number of different types of atoms in a molecule
a simple multiple of the empirical formula showing how many of each type of atom are present in a compound
a sort of shorthand to tell us what different elements there are in a substance and howmany atomes of each there are
Shows the number of atoms of each element present in a molecule.
Formula that indicates the actual number of atoms present in a molecule of a molecular substance.
A formula showing the numbers of different atoms that make up a molecule of a compound.
A type of molecular notation indicating only the quantity of the constituent atoms. molecular weight The sum of the atomic weights of the constituent atoms in a molecule. molecule[L. dim. of moles, mass] Two or more atoms held together by covalent bonds.
The molecular formula of a compound indicates the number of atoms of each kind in the molecule.
a formula that shows the numbers and kinds of atoms in one molecule of a compound
A shorthand method for representing the composition of a molecule using symbols for the type of atoms involved and subscripts for the number of atoms involved.
the exact formula of a molecule, giving the types of atoms and the number of each type.