Question

NaCl dissolves spontaneously in water. Based upon the following reaction, NaCl(s) $\rightarrow$ Na$^{+}$(g) + Cl$^{-}$(g)

• A. negative with a magnitude less than 786
• B. negative with a magnitude greater than 786
• C. positive with a magnitude greater than 786
• D. nothing can be determined about the heat of hydration without more information

Hint:

When a substance dissolves spontaneously, the heat of hydration is typically exothermic.

Answer 1

The Correct Option is B

Since NaCl dissolves spontaneously in water, the heat of hydration must be negative, indicating an exothermic process. The magnitude of the heat of hydration is greater than 786.