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?
a)
(Delta Go products) - (delta Go reactants)
b)
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.
c)
Delta Go = -nFEocell