試題詳解

11. White phosphorus (P4) has two different crystalline forms, α-P₄(s) and β-P₄(s), where the P₄ molecules are packed in different ways. The α-form is always obtained when the liquid freezes. However, it spontaneously converts to the p-form when the temperature is below -76.9 °C (α-P₄(s) → β-P₄(s). Assume that the ▵H and ▵S for this process are temperature independent, which of the following statements are correct?
I. This is an endothermic process.
II. The sign of ▵S is positive for this process.
II. The ▵G at -76.9℃ is zero for this process.
IV. The α-form is less ordered than the β-form.
(A)I and II
(B)III and IV
(C)II and III
(D)I and IV
(E)I, III, and IV