Multiple Choice Chemistry Quiz Template With Answers -Prof. Dan Schwartz Page 2
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65. (5 points) A KCl solution is prepared by dissolving 40.0 g KCl in 250.0 g of water at 25 ˚C. What is
the vapor pressure of the solution if the vapor pressure of water at 25 ˚C is 23.76 mm Hg?
(a) 20.5 mm Hg
(b) 22.1 mm Hg
(c) 22.9 mm Hg
(d) 24.7 mm Hg
6. (5 points) Which of the following pairs of aqueous solutions have roughly the same boiling point?
(a) 0.100 m C
H
O
(glucose) and 0.0333 m CuCl
6
12
6
2
(b) 0.100 m NaCl and 0.100 m C
H
O
(glucose)
6
12
6
(c) 0.200 m NaCl and 0.300 m Na
SO
2
4
(d) 0.100 m KCl and 0.050 m MgBr
2
7. (5 points) The decomposition of dinitrogen pentoxide is described by the reaction below:
2 N
O
(g)
4 NO
(g) + O
(g)
2
5
2
2
If the rate of disappearance of N
O
is equal to 1.40 mol/min, what is the rate of appearance of NO
?
2
5
2
(a) 0.700 mol/min
(b) 1.40 mol/min
(c) 2.80 mol/min
(d) 5.60 mol/min
8. (5 points) The following set of data was obtained by the method of initial rates for the reaction
2–
–
2 HgCl
(aq) + C
O
(aq)
2 Cl
(aq) + 2 CO
(g) + Hg
Cl
(s)
2
2
4
2
2
2
2–
[HgCl
], M
[C
O
], M
Rate, M/s
2
2
4
–7
0.10
0.10
1.3 x 10
–7
0.10
0.20
5.2 x 10
–6
0.20
0.20
1.0 x 10
What is the rate law for the reaction?
2–
–2
(a) Rate = k [HgCl
] [C
O
]
2
2
4
2–
–1
(b) Rate = k [HgCl
] [C
O
]
2
2
4
2
2–
(c) Rate = k [HgCl
]
[C
O
]
2
2
4
2–
2
(d) Rate = k [HgCl
] [C
O
]
2
2
4
9. (5 points) The first-order reaction, SO
Cl
SO
+ Cl
, has a half-life of 8.75 hours at 593 K. How
2
2
2
2
long will it take for the concentration of SO
Cl
to fall to 12.5% of its inital value?
2
2
(a) 0.165 hr
(b) 6.07 hr
(c) 26.2 hr
(d) 38.1 hr
Exam #3
Page 2
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