The salt ammonium perchlorate is soluble in water. When 3.55g of NH₄ClO4 is dissolved in 112.00g of water, the temperature of the solution decreases from 25.00 to 22.75 deg C. Based on this observation, which of the following statements is true?
1) The dissolution of NH₄ClO4 in water is an exothermic process.
2) The dissolution of NH₄ClO4 in water is an endothermic process.
3) The dissolution of NH₄ClO4 in water is a spontaneous process.
4) The dissolution of NH₄ClO4 in water is a non-spontaneous process.
