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Chemistry chp8 Salt 的疑问,请各位大大进来帮帮忙,谢谢
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6.20g of copper(II) carbonate is added to 100cm3 of 14.6g dm-3 hydrochloric acid.Calculate the mass of copper(II) chloride produced.(Relative atomic mass: H,1 ; O,16 ; Cl,35.5 : Cu,64)
问题1:
equation:
CuCO3 + 2HCI ---> CuCl2 + H2O + CO2
以上蓝色字的我了解如何怎么写,但如何form(红字)题目内是没有写明的,我该如何写?
问题2:
你们会用什么简单的formula来做这个题目?我看参考书的都很乱
这个chapter真是做到我很dulan |
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发表于 18-5-2011 02:05 PM
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发表于 18-5-2011 03:14 PM
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回复 1# jackiezz
如果有錯多多包涵。
acid+base/alkali--->salt+water簡單吧?
我自己如何應付chemical equation的呢?動動腦筋
acid+carbonate--->salt+water+CO2
原因是carbonate是carbon compound,想一想acid會腐蝕東西的哦,和carbonate產生reaction當然有CO2.
其實你在chapter7已經學習過了的,所以題目沒有注明react后的product什么
你要會form equation和balance equation先,然后的全部都是mole concept來的(chapter3).
開始回答問題咯:
mole of CuCO3=6.2/124 mole of HCl=1.46/36.5
=0.05mol =0.04mol
**我們要用mole of HCl,因為CuCO3 excess 了。**
From the chemical equation,
mass of CuCl2=0.04/2
=0.02mol
Hence,mass of CuCl2 produces=0.02x(64+71)
=2.7g |
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楼主 |
发表于 18-5-2011 03:52 PM
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发表于 19-5-2011 02:52 PM
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最不懂就是这课了,还要记得能不能soluble,颜色,如何做salt,一大堆东西 |
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发表于 26-5-2011 01:41 PM
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每一课都很难懂。。。什么叫excess?
WbKoay 发表于 26-5-2011 02:20 AM 
excess is like more than its required.
For example: A + B -> 2C
so, 1 mole of A will react with 1 mole of B to form 2 mole of C.
If 2mole of A react with 1 mole of B, means, A is excess because B just got 1mole to react.
understand? |
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发表于 29-5-2011 01:27 PM
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