作者ANN0504 (我要快樂)
看板TransBioChem
標題[問題] 普化
時間Sat May 15 23:49:15 2010
1.The mole fraction of sodium hydroxide in a saturated aqueous is 0.310 .
What is the molality of the solution?
(A)0.301m (B)0.690m (C)1.24m (D)12.4m (E)25.0m
2.Which of the following is accturate comparison of the properties of
nitrogen and oxygen?
(A)Nirtogen is more reactive than oxygen.
(B)Nitrogen does not form naturally-occurring ompounds,but oxygen does.
3.Account for the following facts:
(a)CaF2 is insoluble in water,but NaF is quite soluble.
(b)Molten BeCl2 is a poor electrical condunctor,whereas molten CaCl2 is an
excellent one.
找了很久,實在不懂
@ @有點多~謝謝各位
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1F：推 cen71:回第一題..設水為1mol，從莫耳分率可得NaOH為0.45mol 05/16 19:52
2F：→ cen71:molality.為0.45(NaOH之mol數)除18(水之體積，因設水為1mol) 05/16 19:55
3F：→ cen71:再乘上1000(分母為L)可得解為 25.0m 05/16 19:56
4F：推 a12henry:第二題感覺兩個都錯@@ 05/17 00:42
5F：→ a12henry:第三題a 要水解要克服分子間作用力和溶劑間分子間作用力 05/17 00:44
6F：→ a12henry:還有EN上升 溶解性會增加 所以CaF2分子量較大 要克服的容 05/17 00:45
7F：→ a12henry:劑間作用力較大 而且EN較小 較不容易水解 05/17 00:46
8F：→ a12henry:b的話應該是EN差吧 EN差較大 較易解離 導電性上升 05/17 00:47
9F：推 cen71:我也覺得第二題都錯..O2的活性大於N2..自然界也有N化合物 05/17 01:05