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【单选题】
34gFeS0 4 ·7H 2 0样品受热脱水过程的热重曲线(样品质量随温度变化的曲线)如下图所示
A.
温度为78℃时固体物质M的化学式为FeSO 4 ?5H 2 O
B.
温度为l59℃时固体物质N的化学式为FeSO 4 ?3H 2 O
C.
在隔绝空气条件下,N得到P的化学方程式为FeSO 4 FeO+SO 3 ↑
D.
取适量380℃时所得的样品P,隔绝空气加热至650℃,得到一种固体物质Q,同时有两种无色气体生成,Q的化学式为Fe 2 O 3
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