The question says: Solid potassium iodide decomposes into solid potassium and iodide gas. The answer given has a subscript "2" on the iodine at the start of the equation. Why is the 2 there as a subscript?

World of Chemistry, 3rd edition
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ISBN:9781133109655
Author:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan L. Zumdahl, Donald J. DeCoste
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The question says:

Solid potassium iodide decomposes into solid potassium and iodide gas.

The answer given has a subscript "2" on the iodine at the start of the equation. Why is the 2 there as a subscript? 

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