hce_kmu
112年
物理及化學
第 62 題
Solid KF has a lattice energy of $-804\text{ kJ/mol}$ and a heat of solution (in water) of $-15\text{ kJ/mol}$. RbF has a lattice energy of $-768\text{ kJ/mol}$ and a heat of solution (in water) of $-24\text{ kJ/mol}$. Which salt forms stronger attractions with water?
- A KF, because it releases more heat during the formation of crystal.
- B KF, because it has a more negative heat of hydration.
- C RbF, because it releases more heat during the formation of crystal.
- D RbF, because it has a more negative heat of hydration.
- E Both salts have the same interactions with water.
思路引導 VIP
想像一下，如果你要把一塊積木城堡完全拆散成一顆顆積木，需要花費力氣；而當這些積木被丟進水裡、被水分子緊緊包圍時，又會釋放出能量。如果最後整個過程是放熱的，且我們已知拆散城堡所需的能量，那我們該如何比較哪種積木與水分子的『擁抱』更為有力呢？