2KI --> 2K + I2
I2 is becasue Iodine is an element that cannot stand alone, and therefore bonds with its self.
Answer: The chemical symbols completing the equation is [tex]K\text{ and }I_2[/tex]
Explanation:
Decomposition reaction is defined as the reaction in which a single compound gets decomposed to two or more compounds.
General equation representing decomposition reaction follows:
[tex]AB\rightarrow A+B[/tex]
The chemical equation for the decomposition of potassium iodide follows:
[tex]2KI\rightarrow 2K+I_2[/tex]
By Stoichiometry of the reaction:
2 moles of potassium iodide decomposes to form 2 moles of potassium element and 1 mole of iodine gas.
Hence, the chemical symbols completing the equation are [tex]K\text{ and }I_2[/tex]
