16. wPCl5 + xH2O → yPOCl3 + zHCl，此平衡方程式之係數以下何者為正確?
(A) w = 1, x = 1, y = 1, z = 2
(B) w = 2, x = 2, y = 2, z = 2
(C) w = 1, x = 2, y = 2, z = 4
(D) w = 2, x = 2, y = 2, z = 4

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統計： A(22), B(0), C(1), D(2), E(0) #2914816