在大气压力下, FeCl 3 (s) 与 H 2 O 可以生成 FeCl 3 ·2H 2 O(s), FeCl 3 ·5H 2 O(s), FeCl 3 ·6H 2 O(s), FeCl 3 ·7H 2 O(s) 四种水合物,则该平衡系统的组分数 C 和能够平衡共存的最大 P 为
A.
C = 3, P = 3
B.
C = 3, P = 4
C.
C = 2, P = 3
D.
C = 3, P =5
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