A:2H2(g)+O2(g)═2H2O(1)△H=﹣285.8kJ/mol
B:2H2(g)+O2(g)═2H2O(1)△H=+571.6kJ/mol
C:2H2(g)+O2(g)═2H2O(g)△H=﹣571.6kJ/mol
D:H2(g)+ 12 O2(g)═H2O(1)△H=﹣285.8kJ/mol