Gadhia, Tejas – Homework 2 – Due: Sep 18 2007, 11:00 am – Inst: James Holcombe
1
This
printout
should
have
25
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
The due time is Central
time.
001
(part 1 of 1) 10 points
The temperature at which water boils can be
increased by adding some solute, like ethylene
glycol. This is known as a colligative property.
1.
True
2.
False
002
(part 1 of 1) 10 points
The colligative effects of 1 molal sugar solu
tion would be
?
1 molal sodium chloride
solution.
1.
the same as
2.
less than
3.
greater than
003
(part 1 of 1) 10 points
The vapor pressure of a volatile component
in a solution decreases as its mole fraction
decreases. This is known as
1.
Henry’s Law.
2.
LeChatelier’s Principle.
3.
Raoult’s Law.
4.
Bragg’s Law.
004
(part 1 of 3) 10 points
Consider the following pressure diagram for a
binary liquid containing A and B.
0
1
x
A
30 torr
80 torr
If 3825 g of A (225 g
/
mol) and 675 g of
B (75 g
/
mol) are mixed, what is the vapor
pressure of B?
1.
52 torr
2.
30 torr
3.
62 torr
4.
10 torr
5.
80 torr
005
(part 2 of 3) 10 points
What is the corresponding vapor pressure of
A?
1.
80 torr
2.
30 torr
3.
10 torr
4.
52 torr
5.
62 torr
006
(part 3 of 3) 10 points
What is the corresponding total vapor pres
sure?
1.
62 torr
2.
10 torr
3.
80 torr
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Gadhia, Tejas – Homework 2 – Due: Sep 18 2007, 11:00 am – Inst: James Holcombe
2
4.
52 torr
5.
30 torr
007
(part 1 of 1) 10 points
1,1Dichloroethane (CH
3
CHCl
2
) has a va
por pressure of 228 Torr at 25
◦
C; at the same
temperature,
1,1dichlorotetrafluoroethane
(CF
3
CCl
2
F) has a vapor pressure of 79 Torr.
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 Spring '07
 Holcombe
 Vapor pressure, Freezingpoint depression

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