作者YapYap (never give up)
看板TransBioChem
标题[化学] 台大普化C(95&97) 普化B(96) 问题
时间Mon Jun 1 23:43:10 2009
先谢谢愿意看我问题的人!
=普化(C)97年=
先分享我的选择题答案
1.AD BC C B B
6.C C C A CD
11.A AD C C D
16.BD D D AC A
13.(a)CH3CH(NH2)COOH有geometric isomers吗?
20.For the reaction at 25度C, 2NO2(g)<===>N2O4(g)
CalculateΔG of the reaction if P(NO2)=0.29atm, P(N2O4)=1.6atm
Compounds ΔHf°(kJ/mol) S°(J/mol-K) ΔGf°(kJ/mol)
-----------------------------------------------------------
NO2(g) 33.84 240.5 51.84
N2O4(g) 9.66 304.3 98.28
(a)-5.04kJ (b)1.90kJ (c)46.44kJ (d)-1.17kJ
我的算法是98.28-2x51.84=-5.40kJ，选(a)
但是看到上面板友分享的答案是(b)
再加上我也觉得我的算法怪怪的，之前看到的这种题目好像都是单向反应，可是这题
是可逆反应，不知道算法一样吗? 然後题目提供的压力、ΔH、ΔS我也都没用到...
=普化(B)96年=
II.3.Consider the Harber process, 1/2N2(g)+3/2H2(g)->NH3(g) at 25°C
(a)Calculate the ΔH°,ΔS°,and ΔG°for the reaction.
(e)How is the rate of the reaction, fast or slow?
N2(g) H2(g) NH3(g)
-------------------------------------------
ΔHf°(kJ/mol) -46.19
S° (J/mol.K) 191.50 130.58 192.5
ΔGf°(kJ/mol) -16.66
我的算法:ΔH°= -46.19-(0+0)=-46.19
S°=192.5-(1/2x191.5+3/2X130.5)=-99.12
ΔGf°我想用ΔH°-TΔS°来算，可是验证题目有给的NH3的资料
-46.19-298x192.5x/1000=-103.56，并不等於-16.66阿@@
=普化(C)95年=
分享我的答案 1.BACAC 6.CCBBD 11.ECBCB 16.DCACC
10.(d)At constant pressure and temperature, a decrease in free energy ensures
an increase in entropy of the system.
请问(d)选项是对的吗?
II.3.Consider an ionic compound CxAy where the anions(A) are in a body-centered
cubic arrangement and the cations(C) are located in all of the faces of the
cubic unic cell.
(a)What is the empirical formula of the salt?
(b)If the edge length of the unit cell is 5.00x10 cm and the molar masses of
C and A are 50.0g/mol and 100.0g/mol, respectively,calculate the density
of CxAy.
(c)If the ionic radius of A is 200pm, estimate the ionic radius of C(in the
unit of pm).
我想问的是"cations(C) are located in all of the faces of thecubic unic cell"
这句话是指单位晶格每个面的中心都有一颗C吗?
如果是这样子我算出来的答案是(a)C3A2 (b)4.67x10^-27 不知道对不对?
然後(c)还是不会
希望有人能替我解答!麻烦大家了!
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