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1) Of the following, the entropy of gaseous ________ is the largest at 25 oC and 1 atm.
A) I2
B) F2
C) Cl2
D) Br2
E) O3
2) At elevated temperatures, methylisonitrile (CH3NC) isomerizes to acetonitrile
(CH3CN):
CH3NC (g) --> CH3CN (g)
At the start of an experiment, there are 0.200 mol of reactant and 0 mol of product in
the reaction vessel. After 25 min, 0.121 mol of reactant (CH3NC) remain. There are
________ mol of product (CH3CN) in the reaction vessel.
A) 0.022
B) 0.121
C) 0.200
D) 0.321
E) 0.079
3) Which of the following expressions is the correct equilibrium-constant expression for
the following reaction?
CO2 (g) + 2H2 (g) CH3OH (g)
A)
B)
C)
D)
E)
4) The decay of a radionuclide with a half-life of 3.3 x 105 years has a rate constant (in
yr-1) equal to ________.
A) 4.8 x 105
B) 2.1 x 10-6
C) 4.2 x 10-6
D) 2.8 x 103
E) 5.9 x 10-8
5) The specific heat capacity of methane gas is 2.20 J/g-K. How many joules of heat are
needed to raise the temperature of 7.25 g of methane from 22.0 °C to 57.0 °C?
A) 115 J
B) 558 J
C) 1.26 x 103 J
D) 8.67 x 10-3 J
E) 41.3 J
6) A 24.5 mL aliquot of 0.0938 M H2SO4 (aq) is to be titrated with 0.0295 M NaOH
(aq). What volume (mL) of base will it take to reach the equivalence point?
A) 156
B) 0.136
C) 77.9
D) 39.0
E) 4430
7) As the concentration of a solute in a solution increases, the freezing point of the
solution ________ and the vapor pressure of the solution ________.
A) increases, increases
B) increases, decreases
C) decreases, increases
D) decreases, decreases
E) decreases, is unaffected
8) At 20 oC, a 1.73 M aqueous solution of ammonium chloride has a density of 1.0257
g/mL. What is the mass % of ammonium chloride in the solution? The formula weight
of NH4Cl is 53.50 g/mol.
A) 1.85
B) 3.31
C) 1.68
D) 0.594
E) 9.00
9) In which one of the following numbers are none of the zeros significant?
A) 10.0
B) 103
C) 161.00
D) 0.00050
E) 0.009
10) Calculate the freezing point of a solution containing 20 grams of KCl and 2200.0
grams of water. The molal-freezing-point-depression constant (Kf) for water is 1.86
oC/m.
A) -0.45 oC
B) +0.45 oC
C) -0.23 oC
D) +0.23 oC
E) 1.23 oC
11) Which ion shown below does not exist?
A) Y4+
B) Y2+
C) Y+
D) Zr4+
E) Nb3+
12) A 0.15 M aqueous solution of the weak base B at 25.0 oC has a pH of 8.88. The
value of Kb for B is ________.
A) 3.0 x 10-5
B) 1.8 x 10-5
C) 3.9 x 10-10
D) 1.3 x 10-10
E) none of the above
