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【单选题】
将磷矿石中的磷以 MgNH 4 PO 4 形式沉淀出来并灼烧成 Mg 2 P 2 O 7 称量,计算磷矿石中 P 2 O 5 的质量分数时,换算因数为( )
A.
M (P 2 O 5 )/ M (MgNH 4 PO 4 )
B.
M (P 2 O 5 )/2 M (MgNH 4 PO 4 )
C.
M (P 2 O 5 )/2 M (Mg 2 P 2 O 7 )
D.
M (P 2 O 5 )/ M (Mg 2 P 2 O 7 )
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