Plz help bc this s due at exactly 3:30pm

The reaction q+r2=r2q is found to be first order in r2 and

Calcium chloride +gold(1) oxide—>

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?