Question

2HgO(s) → 2Hg(l) + O2(g). This reaction is _____.

A) Endothermic, H value positive
B) Exothermic, H value positive
C) Exothermic, H value negative
D) Endothermic, H value negative

Answer 1

The reaction 2HgO(s) → 2Hg(l) + O2(g) is endothermic with a positive enthalpy change, so the correct answer is A) Endothermic, H value positive.

Step-by-step explanation:

The reaction 2HgO(s) → 2Hg(l) + O2(g) involves the decomposition of mercury(II) oxide into liquid mercury and oxygen gas. This reaction is endothermic, meaning it requires energy from the surroundings to proceed. During this process, the system absorbs heat, thus the enthalpy change (ΔH) for the reaction is positive. Therefore, the correct answer is A) Endothermic, H value positive.