PPT Slide

Compounds: Formulas, Names, and Masses

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• In chemical formulas, element symbols and numerical  subscripts show the type and number of each atom present.

• There are several types of chemical formulas:

1. The empirical formula shows the relative number of  atoms of each element in the compound.

The empirical formula of hydrogen peroxide is HO; there is one H atom for every O atom (ratio 1:1).

2. The molecular formula shows the actual number of atoms of each element in a molecule of the compound.

• The molecular formula of hydrogen peroxide is H2O2 ;  there are two H atoms and two O atoms in each molecule.

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