Which of the following equations best describes the reaction that occurs when potassium metal reacts with oxygen gas in a combination reaction?
A) K(s) + O2(g) → KO2(s)
B) 4K(s) + O2(g) → 2K2O(s)
C) K(s) + O2(g) → KO(s) + O(g)
D) 2K(s) + O(g) → K2O(s)
E) K(s) + O(g) → KO(s)
Correct Answer:
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