Answer:
A(g)+B(g)⟶C(g) 2A(g)+2B(g)⟶5C(g)
A(s)+B(s)⟶C(g) 2A(g)+2B(g)⟶3C(g):
CO2 will be the first to boil because it will be the first to warm up because it is the closest temperature to 0
The answer to this problem is Beryllium is an alkaline earth metal.