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精英家教網2008年北京奧運會主體育場因外形像“鳥巢”（The Bird Nest）而得名，有一種叫五硼烷的物質結構也好似鳥巢，其化學式為B5H9．下列有關五硼烷的說法錯誤的是（　　）
A、五硼烷屬于化合物B、五硼烷的相對分子質量為64gC、五硼烷中硼元素和氫元素的質量比為55：9D、1個五硼烷分子由5個硼原子和9個氫原子構成
分析：A、由不同種元素組成的純凈物是化合物．
B、根據相對分子質量為構成分子的各原子的相對原子質量之和，進行分析判斷．
C、根據化合物中各元素質量比=各原子的相對原子質量×原子個數之比，進行分析判斷．
D、根據五硼烷分子的構成進行分析判斷．
解答：解：A、五硼烷是由硼元素、氫元素兩種元素組成的純凈物，屬于化合物，故選項說法正確．
B、五硼烷的相對分子質量是11×5+1×9=64，不是64g，故選項說法錯誤．
C、五硼烷中硼元素和氫元素的質量比為（11×5）：（1×9）=55：9，故選項說法正確．
D、由五硼烷的化學式可知，一個五硼烷分子是由5個硼原子和9個氫原子構成的，故選項說法正確．
故選：B．
點評：本題難度不大，考查同學們結合新信息、靈活運用化學式的含義與有關計算進行分析問題、解決問題的能力．
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