K→koh→kcl→kno3→k2o→k2co3→kno3

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This appears to be a series of chemical reactions involving potassium (K) and various other elements. The reactions are as follows:

K (potassium) reacts with oxygen (O) to form potassium oxide (K2O).K2O reacts with carbon dioxide (CO2) to form potassium carbonate (K2CO3).K2CO3 reacts with nitric acid (HNO3) to form potassium nitrate (KNO3).

Therefore, the final product of the series of reactions is potassium nitrate (KNO3).