Identify the oxidizing agent and the reducing agent for 4Li(s)+O2(g)?2Li2O(s)

Identify the oxidizing agent and the reducing agent for 4Li(s)+O2(g)?2Li2O(s).
Express your answers as chemical formulas separated by a comma.

Identify the oxidizing agent and the reducing agent for Mg(s)+Fe2+(aq)?Mg2+(aq)+Fe(s).
Express your answers as chemical formulas separated by a comma.

Answer:

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