4Al (s)+3O 2(g)═2Al 2O 3(s)△H=-2834.9kJ•mol -1①
4Al (s)+2O 3(g)═2Al 2O 3(s)△H=-3119.91kJ•mol -1②
①-②得3O 2(g)═2O 3△H=+285.01kJ•mol -1该反应吸热,等质量的O 2比O 3能量低,所以O 2比O 3稳定,由O 2变O 3为吸热反应,故选:A.
4Al (s)+3O 2(g)═2Al 2O 3(s)△H=-2834.9kJ•mol -1①
4Al (s)+2O 3(g)═2Al 2O 3(s)△H=-3119.91kJ•mol -1②
①-②得3O 2(g)═2O 3△H=+285.01kJ•mol -1该反应吸热,等质量的O 2比O 3能量低,所以O 2比O 3稳定,由O 2变O 3为吸热反应,故选:A.