作者查詢 / guitarspirit
作者 guitarspirit 在 PTT [ TransBioChem ] 看板的留言(推文), 共31則
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1F推: 1.系統是鐵和銀且由題意可知04/05 09:07
2F→: From 1st law ΔU=Q+W=ΔU(Fe)+ΔU(Ag)=004/05 09:08
3F→: m(Fe)*C(Fe)*(Tf-T(Fe))+m(Ag)*C(Ag)*(Tf-T(Ag))=004/05 09:08
4F→: 2. For ideal gas Cp=Cv+R04/05 09:08
5F→: 3.For expansion of an ideal gas at constant P04/05 09:09
6F→: From 1st law ΔU=Q-P(Vf-Vi)04/05 09:09
7F→: 4. For compression of an ideal gas at constant T04/05 09:09
8F→: From 1st law Q=nRTln(Vf/Vi)04/05 09:10
8F推:定義 反應前後 壓力.體積.總莫耳數.溫度03/10 20:50
9F→:反應前為p v n t 反應後為P V N T03/10 20:50
10F→:反應前 pv=ZnRt 反應後 PV=ZNRT03/10 20:50
11F→:反應前後 用同一種 eq'n of state描述氣體行為03/10 20:51
12F→:R為理想氣體常數03/10 20:51
13F→:故(V/v)=(p/P)*(N/n)*(T/t)03/10 20:51
14F→:考慮此反應為恆溫恆壓可推論出 V/v=N/n03/10 20:52
15F→:由題意反應前後體積沒有改變03/10 20:52
16F→:且假設完全反應 故選 N2+O2→2NO03/10 20:52
17F推:我說明一下我假設此反應恆溫恆壓的想法03/10 20:59
18F→:空氣反應前後都是一大氣壓,所以假設恆壓03/10 20:59
19F→:考慮此反應可能很快速或者此反應吸放熱不多03/10 20:59
20F→:故反應前後反應物與產物溫度變化不大假設衡壓03/10 20:59
21F→: 恆溫03/10 21:00
6F推:我查SKOOG的分析化學 附錄 Hg2Cl2的KSP是1.2*10^-1801/01 02:23
7F→:Hg的還原電位應該+0.854v題目給1.62v01/01 02:23
8F→:ΔG=-nFE=-RT㏑ksp=(4*0.854-2*0.92-2*0.27)*F01/01 02:24
9F→:=-8.314*298*㏑Ksp求得Ksp=2.99*10^-1801/01 02:24
10F→:比較接近你給的Ksp XD 原始題目汞的還原電位給1.62v01/01 02:25
11F→:同理代入的話Ksp=4.43*10^-7001/01 02:25
12F→:小時候學的電位能相加是因為ΔG=-nFE的n和F都相等01/01 02:25
13F→:所以總反應的E就變成相加了,所以遇到多個反應不能01/01 02:25
14F→:電位直接相加。01/01 02:26
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