What type reaction took place if reaction is change of H= -462kJ/mol, given:?

Question

Mg(S) + 2HCl (ag) -> MgCl2 (aq) + H2(g)

Answer 1

Exothermic. a negative H means that there is heat released.

Answer 2

That's an exothermic reaction. In other words when magnesium dissolves in hydrochloric acid much heat is produced. The opposite of exothermic is endothermic, then H would be positive.

Answer 3

ΔH for this reaction is negative value in killijoules, meaning that energy is released when magnesium reacts with hydrochloric acid. This is an exothermic reaction. The energy evolved from forming new bonds of the products is greater than the energy put in to breaking the H-Cl bond. Going products back to reactants would require 462kJ/mol, or endothermic.