Endothermic Dissolution Effects

Steps:

• ΔH = +25 kJ/mol is positive, confirming endothermic reaction (statement 1).
• Endothermic process absorbs heat from surroundings, lowering water temperature (statement 2).
• Heat transfers from water to ammonium nitrate for dissolution (statement 3).
• All statements align with endothermic definition, selecting D.

Why D is correct:

• Positive ΔH by definition means endothermic, absorbing heat and cooling surroundings per first law of thermodynamics.

Why the others are wrong:

• A omits heat absorption by solute.
• B omits temperature drop in water.
• C omits endothermic classification.

Final answer: D