Help me with this one asap pls

What will most likely happen when two bromine atoms bond together?

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?

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work