The total number of atoms present in one molecule of cobalt hydroxide is three.
What are atoms and molecules?
Atoms is the fundamental unit of any object and molecule is formed by the combination of one or more atoms.
Decomposition reaction of cobalt hydroxide is shown as:
Co(OH)₂ → Co²⁺ + 2OH⁻
From the stoichiometry of the reaction it is clear that one molecule of cobalt hydroxide contains 1 atom of cobalt and 2 atoms hydroxide. So total number of atoms is 3.
Hence total number of atoms in cobalt hydroxide is 3.
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