推 ayabbe:234題不確定不敢亂說 219.84.126.53 07/04
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作者: ayabbe (芮妮齊薇格) 看板: TransBioChem
標題: Re: [普化] 問幾個問題
時間: Sun Jul 3 22:52:05 2005
※ 引述《u4bj6 (非上不可!!!)》之銘言：
: 1.The enthalpy of vaporization for water is 40.7kj/mol at 1atm (760torr) then
: what is the boiling point of water at 475torr?(Tb=100c R=8.3145j/k mol)
這個用: p2 - Hvap 1 1
ln(-------) = ------- (---- - ----)
p1 R T2 T1
: 2.Rank the following compounds according to increasing values(disorder) of ΔS
: °soln(JK^-1mol^-1) for LiF NaCl KCl and CaS dissolvin in water
: 3.which of the following molecules display optical activity?
: trans-[Cr(en)2Br2]- cis-[Cr(en)2Br2]- [Co(edta)]-
: [Co(en)3]3+ cis-[Pt(NH3)2Cl2] [CrCl2Br2]2-(tetrahedral)
: 4.the compound ZrI4 can be mdescribed as cubic cloest packed anions(I-) with
: the cation(Zr4+)in tetrahedral holes.
: what fraction of the tetrahedral holes is occupied?
: (A)1 (B)1/2(C)1/4 (D)1/8 (E)1/16
: 請各位幫個忙,實在想不出來,快要考試了,覺得有完蛋的感覺
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作者: yiso (myiso) 看板: TransBioChem
標題: Re: [普化] 問幾個問題
時間: Mon Jul 4 00:31:57 2005
※ 引述《u4bj6 (非上不可!!!)》之銘言
: 3.which of the following molecules display optical activity?
: trans-[Cr(en)2Br2]- cis-[Cr(en)2Br2]- [Co(edta)]-
: [Co(en)3]3+ cis-[Pt(NH3)2Cl2] [CrCl2Br2]2-(tetrahedral)
四面體型一定沒有光學異構物(怎麼轉都會回來)
而Cr(en)2Br2-是cis有trans沒有，Pt(NH3)2Cl2是trans有cis沒有
所以有光學活性的就是cis-[Cr(en)2Br2]-、[Co(edta)]-、[Co(en)3]3+
我是用刪去法啦
: 4.the compound ZrI4 can be mdescribed as cubic cloest packed anions(I-) with
: the cation(Zr4+)in tetrahedral holes.
: what fraction of the tetrahedral holes is occupied?
: (A)1 (B)1/2(C)1/4 (D)1/8 (E)1/16
Zr：I＝1：(1/8) ×4＝1：1/2，表示I每形成2個四面體洞只有一半被Zr填滿，
故佔有的百分率＝50%(1/2)
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這應該是93成大化學的試題吧
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◆ From: 59.115.226.3
※ 編輯: yiso 來自: 59.115.226.3 (07/04 00:32)
1.The enthalpy of vaporization for water is 40.7kj/mol at 1atm (760torr) then
what is the boiling point of water at 475torr?(Tb=100c R=8.3145j/k mol)
2.Rank the following compounds according to increasing values(disorder) of ΔS
°soln(JK^-1mol^-1) for LiF NaCl KCl and CaS dissolvin in water
3.which of the following molecules display optical activity?
trans-[Cr(en)2Br2]- cis-[Cr(en)2Br2]- [Co(edta)]-
[Co(en)3]3+ cis-[Pt(NH3)2Cl2] [CrCl2Br2]2-(tetrahedral)
4.the compound ZrI4 can be mdescribed as cubic cloest packed anions(I-) with
the cation(Zr4+)in tetrahedral holes.
what fraction of the tetrahedral holes is occupied?
(A)1 (B)1/2(C)1/4 (D)1/8 (E)1/16
請各位幫個忙,實在想不出來,快要考試了,覺得有完蛋的感覺
--
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