Question

question
is the following process endothermic or exothermic?
h₂o(g) → h₂o(l)
select the correct answer below:
endothermic
exothermic
neither endothermic nor exothermic
both endothermic and exothermic

Explanation:

Step1: Identify the phase - change

The process is condensation, water vapor ($H_2O(g)$) changing to liquid water ($H_2O(l)$).

Step2: Recall heat - transfer in phase - change

Condensation releases heat to the surroundings.

Step3: Define endo/exo - thermic

Exothermic processes release heat, while endothermic processes absorb heat. So this condensation process is exothermic.

Answer:

B. exothermic