Question

which of the following is an endothermic process under room temperature (25°c)? multiple answers. h₂o₍g₎→h₂o₍l₎ h₂o₍l₎→h₂o₍s₎ h₂o₍s₎→h₂o₍l₎ h₂o₍s₎→h₂o₍g₎ h₂o₍l₎→h₂o₍g₎

Explanation:

Step1: Understand endothermic process

An endothermic process absorbs heat.

Step2: Analyze phase - change processes

• For \(H_2O_{(g)}\to H_2O_{(l)}\) (condensation), heat is released.
• For \(H_2O_{(l)}\to H_2O_{(s)}\) (freezing), heat is released.
• For \(H_2O_{(s)}\to H_2O_{(l)}\) (melting), heat is absorbed.
• For \(H_2O_{(s)}\to H_2O_{(g)}\) (sublimation), heat is absorbed.
• For \(H_2O_{(l)}\to H_2O_{(g)}\) (vaporization), heat is absorbed.

Answer:

\(H_2O_{(s)}\to H_2O_{(l)}\), \(H_2O_{(s)}\to H_2O_{(g)}\), \(H_2O_{(l)}\to H_2O_{(g)}\)