The dissolution of ammonium nitrate occurs spontaneously in water at 25 $\circ$ C.As NH₄NO₃ dissolves,the temperature of the water decreases.What are the signs of $\Delta$_rH,$\Delta$_rS,and $\Delta$_rG for this process? A)($\Delta$_rH) 0,$\Delta$_rS 0 B) ($\Delta$_rH) 0,$\Delta$_rS 0,$\Delta$_rG 0 C) ($\Delta$_rH) 0,$\Delta$_rS 0,$\Delta$_rG

Question

The dissolution of ammonium nitrate occurs spontaneously in water at 25 $\circ$ C.As NH₄NO₃ dissolves,the temperature of the water decreases.What are the signs of $\Delta$_rH,$\Delta$_rS,and $\Delta$_rG for this process? A)($\Delta$_rH) > 0,$\Delta$_rS < 0,$\Delta$_rG > 0 B) ($\Delta$_rH) > 0,$\Delta$_rS > 0,$\Delta$_rG > 0 C) ($\Delta$_rH) > 0,$\Delta$_rS > 0,$\Delta$_rG < 0 D)($\Delta$_rH) < 0,$\Delta$_rS < 0,$\Delta$_rG < 0 E) ($\Delta$_rH) < 0,$\Delta$_rS > 0,$\Delta$_rG > 0

Quizplus · Accepted Answer

The dissolution of ammonium nitrate is endothermic, so ΔrH > 0. The process increases disorder, so ΔrS > 0. Since it occurs spontaneously, ΔrG < 0.

The Dissolution of Ammonium Nitrate Occurs Spontaneously in Water at 25