試題詳解

65. fn a coffee-cup calorimeter, 1.60 g NH₄NO₃ is mixed with 75.0 g water at an initial temperature 25.0oC. After dissolution of the salt, the final temperature of the calorimeter contents was 23.3oC.For the dissolving process, how many of the following thermodynamic functions: ,and , are positive in signs?
(A) 0
(B) 1
(C) 2
(D) 3
(E) 4