Which of the following equations best describes the reaction that occurs when potassium metal reacts with oxygen gas in a combination reaction?

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)


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