25. Mixing 20 mL of a 4.0 M sodium chloride solution with 40 mL of a 2.0 M calcium chloride solution results in a solution with a chloride ion concentration of  M.
(A) 2.67
(B) 3.33
(C) 4.00
(D) 4.33
(E) 5.00

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統計： A(5), B(4), C(33), D(0), E(0) #2020329