Answer: endothermic, [tex]2HgO\rightarrow 2Hg+O_2[/tex]
Explanation:
Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
All decomposition reactions are endothermic as heat is absorbed by the reactants to break the bonds in the reactants.
Decomposition of [tex]HgO[/tex] is given by:
[tex]2HgO\rightarrow 2Hg+O_2[/tex]
