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J-2
4.
(Exp D) A student recorded the following data when collecting nitrogen gas in a buret above water:
barometric pressure
720.0 mm Hg
temperature
23.3
oC
height of water column
3.30 cm
What is the pressure of nitrogen, N2, gas (in mm of Hg) under these conditions?
a.
665.5
b.
696.1
c.
698.3
d.
720.0
e.
743.9
5.
(Exp E) The following reaction was used to study chemical equilibrium:
Fe
3+
(aq)
+ NCS
-
(aq)
[Fe(NCS)]
2+
(aq)
(pale yellow) (colorless) (deep rust-red)
The color of the equilibrium solution could be lightened by adding which of the following reagents to the
equilibrium solution?
a.
NaOH
(aq)
b.
NaNO
3(aq)
c.
Fe(NO3)
3(aq)
d.
KNCS
(aq)
e.
[Fe(NCS)]
2+
(aq)
6.
(Exp E) Assume the following reaction in solution
A
(aq)
+ B
(aq)
2 C
(aq)
has a Kc = 1.0. The initial concentrations are: [A] = 0.010 M, [B] = 1.0 M, and [C] = 2.0 M.
Which of the following statements is true?
a.
Q < Kc, reaction is moving to the left
b.
Q > Kc, reaction is moving to the right
c.
Q = Kc, reaction is at equilibrium
d.
Q > Kc, reaction is moving to the left
e.
Q < Kc, reaction is moving to the right
7.
(Exp F) In this experiment, the equilibrium for the following reaction was studied:
I
2(aq)
+ I
-
(aq)
I3
-
(aq)
The titration of 30.05 mL of the aqueous layer containing a mixture of I
2(aq)
and I
-
3(aq)
required 16.20 mL
of 0.1455M S2O3²
-
, thiosulfate, solution to reach the indicator endpoint. What is the molarity of the (I2
and I3
-
)
(aq)
in the aqueous layer?
a.
0.03922 M
b.
0.07844 M
c.
0.1349 M
