作者kirarapon (我要吐了...............)
看板TransBioChem
标题[问题] 台大94C电热化学
时间Sun Jul 4 19:56:48 2010
我不知道像这样要怎麽写阴阳极....
III.A galvanic cell is constructed as follows:
Zn│0.1M ZnSO4││0.1M KMnO4,0.01M Mn2+,[H+]=1.0M│Pt
Answer the following questions using the thermodynamic data(at 25C) below
Zn(s) Zn2+(aq) Mn2+(aq) MnO4-(aq) H+(aq) H2O(l)
______________________________________________________________________________
ΔHfo(kJ*mol-1) 0 -154 -221 -541 0 -286
Sfo(J*K-1*mol-1) 42 -112 -74 191 0 70
(A)Write the balanced cell reaction and indicate the oxidizing and reducing
agent.
(B)Find ΔHo and ΔSo for the cell reaction at 25度C
(C)Calculate ΔGo and Ecello for the cell reaction at 25度C
(D)Calculate the cell potential for the constructed galvanic cell at 25度C
(E)If the cell generates a constant current of 1.0A for the first 5 minutes,
find the rate of disappearance (in M/min) at 25度C for MnO4- during this
period of time (F=96485 coulombs)
因为第一题的式子列不出来
後面的题目就不晓得要怎麽做
请问像这类题目
下面的小题是可以直接用题目的数字资料算出吗?
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 119.77.222.54
1F：推 nodal:从给的条件先写半反应 对照写很好写的 07/04 20:37
2F：→ nodal:Zn→Zn2+ + 2e- 跟 Mn7+ + 5e- → Mn2+ 07/04 20:42
3F：→ nodal:合起来"5Zn"+"2MnO4-"→ "5Zn2+"+"2Mn2+" 发现多O 07/04 20:45
4F：→ nodal:补H进去 "5Zn"+"2MnO4-"+"16H+"→"5Zn2+"+"2Mn2+"+"8H2O" 07/04 20:47
5F：→ nodal:完成 07/04 20:47
6F：推 nodal:下面的题目只要抓到总共有10个电子转移就能算了 07/04 20:49
7F：→ kirarapon:我会了!!非常感谢!! 07/05 17:22