Both aluminum and zinc are used in "air batteries", those that use oxygen from the air as an oxidizing agent. These reactions take place in one type or the other:

4Al(s) + 3O2(g) --> 2Al2O3(s)
2Zn(s) + O2(g) --> 2ZnO(s)

a) Calculate DeltaG^o for these reactions at 25 degrees C

b) What is the maximum number of kilojoules that can be extracted from one pound (454 g) of each metal?

c) What is the voltage, Eo(cell)of each battery to 3 significant figures?

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  1. a)
    (Delta Go products) - (delta Go reactants)

    For the Al, you have calculated the delta Go in kJ for 2 mols Al2O3 or 4 mols Al. Convert that to 454 g Al Same thought process for the Zn reaction.

    Delta Go = -nFEocell

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