作者pap641217 (Plain&AttractivePhysics)
看板Chemistry
標題Re: 幾題化學請教？
時間Fri Jul 7 20:27:34 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
可以稍微提示一下作法嗎？小弟的高中化學實在忘的差不多了 感恩喔！
--
※ 發信站: 批踢踢實業坊(ptt.cc)
◆ From: 61.30.157.191