How much energy is produced when 93.5 grams of oxygen reacts with 13.2 g hydrogen in the following reaction?
2 H2 + O --> 2 H2O
H = -572 kJ

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?