作者finalpoet (finalpoet)
看板TransBioChem
标题[问题] 普化问题
时间Sat May 29 22:40:26 2010
1) The boiling point of an aqueous 1.83 M (NH4)2SO4 (molar mass = 132.15
g/mol) solution is 102.5°C. Determine the value of the van't Hoff factor
for this solute if the Kb for water is 0.512°C/m.
A) 3.0
B) 3.6
C) 1.8
D) 2.7
E) 2.3
从题目给的数据算得出答案吗？
2) Place the following substances in order of decreasing vapor pressure at a
given temperature.
BeF2 CH3OH OF2
A) CH3OH > OF2 > BeF2
B) BeF2 > OF2 > CH3OH
C) OF2 > CH3OH > BeF2
D) OF2 > BeF2 > CH3OH
E) BeF2 > CH3OH > OF2
如何比较vapor pressure?
3) Place the following in order of increasing dipole moment.
I. BCl3 II. BIF2 III. BClF2
A) I < II = III
B) II < III < I
C) I < II < III
D) II < I < III
E) I < III < II
请高手帮忙一下
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