For each of the following redox reactions in the, identify the oxidizing agent and the reducing agent.
2na(aq)+2h2o(l)→2naoh(aq)+h2(g)
c(s)+o2(g)→co2(g)
2mno−4(aq)+5so2(g)+2h2o(l)→2mn2+(aq )+5so2−4(aq)+4h+(aq)

Its the second one nonmetals are moldable and easily shaped 

Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.