已知:物质的能量越低越稳定,白磷转化为红磷是放热的,据此下列说法

已知:物质的能量越低越稳定,白磷转化为红磷是放热的,据此下列说法中正确的是(   )

A、白磷转化为红磷是物理变化

B、在相同条件下红磷比白磷稳定

C、相同条件下,红磷所具有的总能量比白磷的高

D、相同质量的红磷和白磷完全燃烧放出的能量相等

 

答案

B

解析:白磷转化为红磷是放热反应,说明白磷的能量高于红磷的,所以红磷比白磷稳定。同素异形体之间的转化属于化学变化。既然白磷的能量高于红磷的,所以相同质量的红磷和白磷完全燃烧放出的能量不相等,白磷放出的能量要高于红磷放出的能量。答案是B。

 

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