When a solute dissolves spontaneously in a liquid, the reaction is frequently exothermic. NH4NO3, on the other hand, dissolves endothermically in water and is hence employed in cold packs. Which of the following statements concerning NH4NO3 dissolution is TRUE? a. The increase in entropy during dissolution outweighs the positive change in enthalpy. b. The ΔS of the process is negative. c. The ΔH of the process is zero. d. The ΔG of the process is positive.

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