Thermite is a mixture of powdered metallic aluminum and iron oxide (usually Fe₂O₃). Although stable at room temperature, the reaction 2Al + Fe₂O₃ →Al₂O₃+ 2 Fe proceeds quickly when thermite is heated to its ignition temperature. The reaction itself generates much heat. Thermite is used as an intense heat source for welding and is particularly useful because it does not need an oxygen supply. What is the energy densityin mega joules per kilogram of thermite?