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Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決
Yahoo!奇摩知識+ - 分類問答 - 科學常識 - 已解決 
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3題化學,想不出來 頭好痛......%
Aug 22nd 2013, 12:21

第一題:
  因為7.17克的PbO2加熱後,產生6.85克的純物質,則所產生的氧氣質量為:
    O2質量=7.17 - 6.85=0.32 克
  所以,可計算出PbO2和O2的莫耳數分別為:
    PbO2的莫耳數=7.17/239=0.03 mol
    O2的莫耳數=0.32/32=0.01 mol
  故可知其反應方程式中,PbO2:O2=3:1,所以列式如下:
    3PbO2 -----> X + O2
  因此,X化合物可推知為Pb3O4。

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