Which one of the following has the highest standard molar entropy,S°,at 25°C?

Question

Quizplus · Accepted Answer

The standard molar entropy, S°, is related to the degree of disorder or randomness of a substance. Since the size of the halide ion increases as you move down the periodic table, the lattice structure of the solid becomes more open and the disorder, or entropy, increases. Therefore, NaI, being the largest and most "disordered" of the halide salts, has the highest standard molar entropy at 25°C.

Which One of the Following Has the Highest Standard Molar