問題詳情
50. 含 MgCl2 的不純樣品 1.190 公克，經溶解後，與過量沈澱劑 ( NH4 )2 HPO4 反應，使完全生成 NH4 MgPO4 沉澱，將此沉澱物灼熱得 1.113 公克的Mg2P2O7。請問上述 MgCl2 不純樣品中含多少重量百分率的 MgCl2 ？( 原子量：Mg = 24.3，P=31，Cl = 35.5，O=16 )
(A) 80 %
(B) 40 %
(C) 20 %
(D) 10 %
(A) 80 %
(B) 40 %
(C) 20 %
(D) 10 %
參考答案
答案：A
難度：非常困難0
統計：A(0),B(0),C(1),D(0),E(0)
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