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QQ312

求化學式判斷方法

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下列何者為硫酸亞鐵的正確化學式?

(A)FeSO     (B)Fe(SO4)2      (C)Fe(SO4)     (D)Fe(SO4)2                  解:(A)

 

像這種題目如果是看過的化學式可能會有印象,沒看過的話該怎麼判斷 ?

看價電子數? 那怎麼知道元素帶幾個正電or負電? 

根基不好 求釐清 

感謝回復

 

 

 

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好久沒用到化學了,不過勉強還記得一點可以回答你

中文:硫酸→SO4是-2價電子     亞鐵是Fe(+2價電子) 鐵是Fe(+4價)      @@@價數要背

然後+原子在前   -價原子在後   總分子價數和為0

所以是FeSO4

Edited by DuDulu010
錯字

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