KNO3(s) is soluble in water and the temperature of the solution decreases as dissolution occurs. Which...
KNO3(s) is soluble in water and the temperature of the solution decreases as dissolution occurs. Which of the following statements most likely applies to this system?
a) The dissolution is exothermic with a favorable entropy change.
b) The dissolution is exothermic with an unfavorable entropy change.
c) The dissolution is endothermic with a favorable entropy change.
d) The dissolution is endothermic with an unfavorable entropy change.
e) None of the above.
Homework Answers
Exothermic process is the one in which heat is liberated from the process to surroundings.
Endothermic process is the one in which heat is absorbed by the process from the surroundings.
Since the dissolution of KNO3 results decrease in temperature of the solution, dissolution process absorbs energy from the surrounding. So, it is endothermic process.
Randomness of particles increases in solution compared to solid. So, entropy increases.
Therefore, the correct option is c).
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