Concerning the thermite reaction, (a) Use data from Appendix D to calculate r H at 298 K for the reaction below. (b) Write an

Concerning the thermite reaction, 

(a) Use data from Appendix D to calculate Δ_rH° at 298 K for the reaction below.

(b) Write an equation for the reaction when MnO₂(s) is substituted for Fe₂O₃(s), and calculate  Δ_rH° for this reaction.

(c) Show that if MgO were substituted for Fe₂O₃, the reaction would be endothermic.

2 Al(s) + FeO3(s) 2 Fe(s) + AlO3(s)