./
(CHEM 101 + 103 CHEM)
1438-1439 HI 2017-2018 G
THIRD SEMESTER
FINAL EXAM
Date:
Sunday
: ,.-'il
l/12/1439 H
......................................................................................................
Time: 1:00- 4:00pm
l.:JI ~~.;ll
........................................................................................... :~.
Time allowed: 180 minutes
.............................................................................................. : ~~~
. ~.)
Write your answer in the table below
QI:
~
Q8:
Q2:
1)
A
Q9:
Q3:
Q4:
QJO:
Qll:
~
1;,
'&
Q15:
~
Q22:
c
Q29:
J)
Q36:
Q16:
1)
Q23:
c_
QJO:
A
Q37:
&
\)
Q17:
A
ll
Q24:
f\
QJJ:
l)
Q38:
Q25:
c_
Q32:
D
Q39:
~
Q40:
c
QJ8:
Q5:
c
Q12:
c
QJ9:
c
Q26:
C'
Q33:
c
Q6:
t\
Q13:
J)
Q20:
c
Q27:
\)
Q34:
~
1)
Q14:
A
Q21:
\)
Q28:
11
Q35:
Q7:
A
A
(_
II
A
1
\
lA
1
H
VIllA
~
I 008
3
2
IIA
4
Li
Be
6 94
11
9 01
12
INa · Mg
I 23.oo
19
13
lilA
5
3
IllS
21
4
IVB
22
38
39
Sr
y
87 62
56
88.91
71
24.31
20
I K Ca Sc
I 39.09 40 08 .14 96
I
37
i Rb
1 85.47
1
s5
' '~-~1
[
~r
(223]
'
l
5
VB
23
Ti
v
6
VIS
24
47 87
40
50.94
41
52.00
42
7
VIIS
25
8
26
174 97
103
Ra Lr
(226]
(262]
10
28
11
18
29
12
118
30
54 94
43
55.85
58.93
44
~5
58 69
46
63.546
47
65.41
48
Zr Nb Mo Tc Ru Rh Pd Ag Cd
91 23
72
92.91
73
178 49
104
180 95
10 5
8
c
15
VA
7
16
VIA
8
N
0
10.811
13
12.01
14
14.01
15
16.00
16
19.00
17
35.45
35
AI
Si
p
s
26.98
31
28 09
32
30.97
33
32.07
34
95.94
74
[98]
75
101 07
76
183 84
106
186 2 1
107
190 23
108
102.91
n
lr
192 22
109
106.42
78
107 87
79
11 2.41
80
69.72
49
72.64
50
74 9216
51
78 96
52
In Sn Sb Te
114.82
81
118.71 121 .760 127.60
82
84
83
(262]
He
4 003
10
F Ne
20.18
18
Cl Ar
39 98
36
[266]
(264]
(269]
(268]
19697
111
200.59
112
20438
113
207 2 208.980
(209]
[271]
[272]
(285]
(286]
Constants:
I atm = 760 torr = 760 mm Hg = 101.325 k.Pa
R = 0.0821 atmLmor 1 K" 1 = 8.3 14Jmor 1 K-1
79 90
53
83.80
I
Xe
126.90
85
131 29
86
54
Pt Au Hg Tl Pb Bi Po At Rn
195.08
110
Rf Db Sg Bh Hs Mt Ds Rg Uub Uut
[261]
17
VIlA
9
Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Ba Lu Hf Ta w Re Os
137.33
88
9
VIliS
27
14
IVA
6
NA (Avogadro$ Number) = 6.022 x t023
l atm.L = 101 .325 1
(210]
(222]
Q8: What is the correct formula for Lithium chloride
Ql: How many significant figures are in 0.00854?
7
a)
b)
c)
d)
monohydrate?
a) LiCl
b) LiCl.H20
c) LiCI.2H20
d) LiC1.3H20
3
4
5
Q2: What is the volwne in cm3 of a 2.50 g block of
metal whose density is 6. 72 g/cm3?
a) 16.8
b) 2.69
c) 0.0595
d) 0.372
Q9: What is the mass, in grams, of2 xl021 atoms ofpotassiwn?
a) 8.3
b) 0.13
c) 1.3
d) 0.003
Q3: Which of the following is a chemical change?
a)
b)
c)
d)
Oxidation in air.
Freezing of water.
Crushing a can.
Dissolving sugar.
QJO: A sample of Freon was found to contain 0.423 g
C, 2.50 g Cl, and 1.34 g F. What is the empirical formula
of this compound?
a) C2ClF
b) CChF2
c) CChF
d) CClF2
Q4: Which of the following is an extensive property of
matter?
a) Color.
b) Mass.
c) Boiling point.
d) Density.
Q5: Which of the following has a positive charge?
a)
b)
c)
d)
Neutron.
Electron.
Proton.
Atom.
Q6: How many r,rotons (p), neutrons (n), and electrons
(e) are there in " 97Au+n atom?
a) 79 p, 118 n, 78 e
b) 79 p, 79 n, II 7 e
c) 197 p, 118 n, 78 e
d) 197 p, 79 n, 1 17 e
Q7: What is the correct formula for potassium sulfite?
a) KHS03
b) KHs04
c) K2S04
d) K2S03
1
Qll: In the following reaction:
Mg + 2 HCl
~ MgCh + H2
How many grams of magnesiwn (Mg) are needed to
produce 10 grams of hydrogen (H2)?
a) 226.3
b) 10.0
c) 12.1
d) 121.5
Q12: If 0.142 moles of chromiwn (Cr) and 0.180 moles
of chlorine (Cl) molecule react according to the equation:
2 Cr + 3 Ch
~ 2 CrCi]
How many grams of chromium (III) chloride will form?
a) 22.5
b) 28.5
c) I9.0
d) 15.8
2
QJ3: The combustion of methyl alcohol in an abundant
excess of oxygen follows the equation:
2CH 30H (f)+ 302 (g)
11 2C02 (g)+ 4H20 Cg)
When 6.40 g ofCH30H was mixed with 02 and ignited,
6.12 g of C02 was obtained. What was the percentage
yield of C02?
a) 65.4
b) 63.5
c) 61.2
d) 69.5
Q14: A scuba diver' s tank contains 0.29 kg of02 compressed into a volume of 2.3 L. Calculate the gas pressure in (atm) inside the tank at 9 °C.
a) 91.2
b) 9.12
c) 0.91
d) 2.30
QJ5: A sample of gas occupies 50.0 L at 15.0 oc and
640.0 mmHg pressure. What is the volume in (L) at
STP?
a) 47.4
b) 39.9
c) 42.1
d) 44.7
QJ6: Calculate the molar mass (in g/mol) of a gas if
35.44 g of this gas stored in a 7.50 L tank exerts a pressure of 60.0 atm. at a constant temperature of35.5 °C.
a) 4.4
b) 25.3
c) 17.7
d) 2.0 .
QJ7: A mixture of7.0 moles ofH2, 3.0 moles ofN2, and
2.0 moles of 02 are placed in a flask. When the partial
pressure of the oxygen is 78.00 mrn Hg, what is the total
pressure (in mm Hg) in the flask?
a) 468
b) 780
c) 936
d) 234
QJ8: Calculate the volume ofNH3 gas (in L), measured
at 685 torr and 21 °C that is produced by the complete
reaction of 27.0 g of CaO, with excess NH4Cl, according to:
CaOcs> + 2NH4C~.., ~ 2NH,., + CaCI •.., + H.O..
a)
b)
c)
d)
25.8
29.4
32.5
35.3
Ql9: A system has Llli = -300 J while releasing 100 J of
heat energy and expand against 0.5 atm. What is the
change in the volume (L)?
a) 3
b) 2
c) 4
d) 5
Q20: A 19.6 g piece of aluminum at 61.67°C is put into
a vessel containing 26.7 g of water at 25°C. The temperature increased to 30°C. What is the specific heat of
the metal? (The heat capacity (J/g°C) of H20 is 4.18
J/goC).
a) 0.814
b) 0.842
c) 0.898
d) 0.782
Q21 : The work done when a gas is expanded in a cylinder is -199 1. A heat transfer of 270 J occurs from the
surrounding to the gas. Calculate 6E of the gas in J.
a) -71
b) -469
c) +469
d) +71
Q22: Calculate the work done (in 1) when 4.0 L of
C 2H6 reacts with 14 L of 02 against a pressure of 1.0
atm.
2 C2H6(g) + 7 0 2(g) -- 4 C02(g) + 6 H20 cl)
a) -S.O x 103
b) -2.5 x 104
c) +2.5x 104
d) +5.0x 103
3
-
.-J
Q23: Use the given standard enthalpies of formation to : Q27: What amount of heat energy (kJ) is released in the
calculate the heat of reaction of the following reaction: : combustion of 4.00 g of C4H IO(g)?
0
: 2C4H t O(g)+ 1302(g)-+ 8C02(g)+ I OH20(I) 6H = -5756 kJ
2 Na202(s) + 2 H20(/)--+ 4 NaO~s) + 02(g)
I
0
nH f Na202<s> = -504.6 kl/mole
nH0 f H20(I) = -285.8 kJ/mole
6H0 f NaOH(s) = -426.8 kJ/mole
a)
b)
c)
d)
:
+126.4
+208.2
-126.4
-208.2
Q28: Which is correct for the following endothermic reaction carried out at constant pressure?
2 N20 <s> + 02 <s> --+ 4 NOes>
Q24 : Which of the following equations represents a reaction that provides the heat of formation of carbon dioxide (C02)?
a) C(s) + 0 2(g) --+ C02(g)
b) 2 CO<g> --+ C02<s> + C<s>
c) co<s> + 112 o2<s> - co2<s>
d) COcs> + Ocs> --+ C02<s>
Q25: When 325 J of heat absorbed by 23.6 g of octane,
CsHts, the temperature increases by 6.20°C. Calculate
the molar heat capacity of octane (J/mole. 0 C).
a) 235
b) 179
c) 254
d) 288
-------------------------------------------------- ------------
Q26: Given the following equations and 6H0 values, de-
termine the heat of reaction at 298 K for the reaction:
C<s> + 2 H2<s> --+ CH.<s>
C<s> + 0 2<s> --+ C02<s>
6H 0 /kJ = -393.5
H2<s>+ 1/2 02<s> --+ H20(I)
6H0 /kJ = -285.8
C02< 8>+ 2 H20 (I)--+ CH.t<s> + 2 02<s> 6H0 /kJ = +890.3
a)
b)
c)
d)
+74.8
+2 11.0
-74.8
-211.0
a) 208
b) 170
c) 182
d) 198
a) q< O
b) Llli < 6H
c) Llli = 6H
d) 6E> 6H
Q29: In all endothermic reactions studied under constant pressure:
l
I
I
I
I
I
I
I
I
I
I
a) q = 0 at STP.
b) 6E = 0 ifw < 0.
c) Llli = Oifw > O.
d) q > O.
QJO: Nicotine has the empirical formula C5 H7N. A
solution of 0.80 g of nicotine in 12.0 g of water boils at
100.21 °C at 760 mm Hg. What is the molecular formula of nicotine? (Kb = +0.512°C/m)
a) C10H14N2
b) C1sH21N3
c) C2sH3sNs
d) C2oH2sN4
------------------------------------------------------------------
4
QJ!: The boiling point of a solution of2.40 g of biphenyl (C 12H10) in 75.0 g of benzene (C~6) is
80.62°C. The nonnal boiling point of benzene is
80.1 0°C. What is the molal boiling point constant
(°C/ m) for benzene?
a) 2.2
b) 2.7
c) 2.0
d) 2.5
------------------------------------------------------------------
Q32: Sucrose, C 12H220u, is a nonvolatile nonelectrolyte. What is the freezing point of a solution of 3.50 g
of sucrose in 20.0 g of water? (Kr = 1.86°C/m)
a)
b)
c)
d)
-0.750
-1.30
-1.15
-0.951
Q37: A solution is prepared by mixing 1.15 mole C1H16,
1.48 mole CsH1s and 2.71 mole C9H2o. What is the mole
fraction ofC1H16?
a) 0.215
b) 0.285
c) 0.333
d) 0.200
Q38: A solution of 1.02 g of hemoglobin in 50.0 g of
water has an osmotic pressure of 5.85 mm Hg at 25°C.
What is the molecular weight of hemoglobin?
QJJ: How many moles of lithium chlorate (LiCl03)
are in 153 mL of a 1. 764 M solution?
a)
b)
c)
d)
Q36: What volume (mL) of concentrated HCl ( 12.1
M) should be used to prepare 250.0 mL of a 0.500 M
solution?
a) 10.3
b) 11.5
c) 10.6
d) 11.2
0.340
0.2 10
0.270
0.310
Q34: Calculate the molarity of a solution of 2.12 g of
KBr in 458 mL of solution.
a) 4.25 X 10"1
2
b) 3.89 x
c) 5.99 X 10"2
d) 3.89 x 1o·l
w-
Q35: Concentrated HN03 is 70.0% HN03 by mass and
has a density of 1.42 g/mL. What is the molality of this
solution?
a) 37.0
b) 29.0
c) 34.0
d) 27.0
a)
b)
c)
d)
3.02 x
2.17 X
6.48 x
4.92 X
104
102
104
107
Q39: The vapor pressure of benzene, C6~. at 25°C is
93.4 torr. What will be the vapor pressure in torr at
25°C for a solution of 56.4 g of the nonvolatile solute,
C2o~2, in 1000 g of benzene?
a)
b)
c)
d)
90.2
92.0
90.8
91.6
Q40: What is the osmotic pressure, in torr, of an aqueous solution containing 5.0 g of sucrose, C 12H220 1"
per liter at 25°C?
a) 230
b) 241
c) 271
d) 222
5