作者pap641217 (Plain&AttractivePhysics)
看板Chemistry
标题几题化学请教？
时间Wed Jul 5 16:06:58 2006
Which of the following compounds has the lowest boiling point?
a. CH3OCH3
b. CH3CH2CH3
c. CH3COOH
d. All the boiling points are about the same
since the molar masses of the three compounds
are essentially equal.
For which process is ΔS negative?
a. evaporation of 1 mol of CCl4(l)
b. mixing 5 mL ethanol with 25 mL water
c. compressing 1 mol Ne at constant temperature from 1.5 atm
to 0.5 atm
d. raising the temperature of 100 g Cu from 275 K to 295 K
For the process CHCl3(s) → CHCl3(l), ΔH° = 9.2 kJ/mol
and ΔS° = 43.9 J/mol×K. What is the melting point of chloroform?
a) -63°C
b) 210°C
c) 5°C
d) 63°C
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※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 61.30.157.191
1F：→ cjtina:aca (?) 07/05 16:25
2F：推 AAAM:B C 07/05 19:40
3F：推 shok:B C A 第二题的C compress压力不是应该变大吗? 07/06 21:14
4F：→ cjtina:噢'我呆呆..... 是 bca /_\ 07/06 23:38