这份考卷有以下几个问题 想请大家帮忙解答!! 8. Which one of the following atoms has the lowest second ionization energy? (A)Na (B)Mg (C)Al (D)K (E)Ba 问第二游离能最低的 所以选了2A族 但为什麽答案是B不是E Ba也是2A族 而且半径较大 游离能应该比较小不是吗? 14. Which one of the following transition elements has a positive Eo for M2+(aq) +2e→ M(s)? (A)Mn (B)Co (C)Ni (D)Cu (E)Zn 不太明白这题的答案是(D) 非选 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 (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) 这两题不晓得要怎麽算 用了Q=I*t=nrF 但不晓得要算什麽@@ 再麻烦各位帮忙 感激不尽!! --

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