[物化] 熱力學
Q1.From the following statements,
(1) A gas reaction never goes to completion.
(2) The chemical potentials of reactants and products at reaction equilibrium
are equal.
(3) The chemical potential of a spontaneous gas reaction is always from the
higher to the lower side.
(4) According to Le Chatelier's principle, when an independent variavle of a
system at equilibrium is changed, the equilibrium shifts in the direction
that tends to reduce the effect of the change.
Choose the correct statments
想法：
(2) 反應平衡時，△G=G(產物)-G(反應物)=0，G(產物)=G(反應物)，化勢也相同
(3) 自發過程，△G<0 所以由化勢高的初狀態到化勢低的末狀態
(4) 勒沙特列原理
選項(1)一直想不出來怎麼說明?請版大們指點
參考答案：(1)(2)(3)(4)
Q2.Take place CaCO3(s) in a close vessel and is heated to 737K, CaCO3(s) will
decompose to form CaO(s) and CO2(g). Determine the degree of free dom for the
system when the reqction reach equilibrium.
補習班提供的系統獨立成分數的算法：
C = N-M-R, N是系統的總成分數, M是已知條件, R是反應平衡方程式數目
M =2-1=1 想請問這是怎麼來的?因為在解這題的時候 只想到CaCO3(s)分解成CaO(s)和
CO2(g)，所以CaO和CO2比例是1:1 所以M=1 可是不懂解答的M =2-1=1怎麼來的?麻煩版大
指點 謝謝
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◆ From: 111.252.229.175
※ 編輯: darkrate 來自: 111.252.229.175 (03/05 22:39)
→
03/05 22:40, , 1F
03/05 22:40, 1F
→
03/05 22:40, , 2F
03/05 22:40, 2F
推
03/05 23:20, , 3F
03/05 23:20, 3F
推
03/05 23:22, , 4F
03/05 23:22, 4F
→
03/06 01:08, , 5F
03/06 01:08, 5F
→
03/06 01:11, , 6F
03/06 01:11, 6F
謝謝版大們的解答
第二題忘了補上講義提供的答案 抱歉
講義的答案如下：M=2-1=1 C=3-1-1=1 P=3 F=C-P+1=1-3+1=-1
不過覺得講義給的答案一整個怪@@
※ 編輯: darkrate 來自: 111.252.203.54 (03/06 15:22)
※ 編輯: darkrate 來自: 111.252.203.54 (03/06 15:57)
→
03/06 19:14, , 7F
03/06 19:14, 7F
→
03/06 22:09, , 8F
03/06 22:09, 8F
推
03/08 20:42, , 9F
03/08 20:42, 9F
→
03/14 12:49, , 10F
03/14 12:49, 10F
推
03/17 14:10, , 11F
03/17 14:10, 11F