If a cube of ice at 0 °C is placed outside on a warm summer day,the ice will melt spontaneously.What are the signs of Δ_rH,Δ_rS,and Δ_rG for the process? A) Δ_rH 0,and Δ_rG

Question

If a cube of ice at 0 °C is placed outside on a warm summer day,the ice will melt spontaneously.What are the signs of Δ_rH,Δ_rS,and Δ_rG for the process? A) Δ_rH < 0,Δ_rS > 0,and Δ_rG < 0 B) Δ_rH < 0,Δ_rS < 0,and Δ_rG < 0 C) Δ_rH < 0,Δ_rS > 0,and Δ_rG > 0 D) Δ_rH > 0,Δ_rS > 0,and Δ_rG < 0 E) Δ_rH > 0,Δ_rS < 0,and Δ_rG > 0

Quizplus · Accepted Answer

The melting of ice into water is an endothermic process (absorbs heat) so ΔH > 0. The disorder increases as solid ice turns into liquid water, so ΔS > 0. For a process to be spontaneous at constant temperature and pressure, ΔG must be < 0.

If a Cube of Ice at 0 °C Is Placed