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ANSWERS TO TEST YOURSELF QUESTIONS 1 1CHEMISTRY FOR THE IB DIPLOMA © CAMBRIDGE UNIVERSITY PRESS 2011
Answers to test yourself questions 9 a 2.00 g b 1.67 g c 2.29 g
10 CO2 CH HO C3H8 H2O PCl5 C6H5CH3
11Empirical
formula
Relative
molecular mass
Molecular
formula
HO 34.02 H2O2
ClO3 166.90 Cl2O6
CH2 84.18 C6H12
BNH2 80.52 B3N3H6
12 a CH3 b C2H6
13 Cl2O
14 I2O5
15 C4H10O
16 Fe2O3
17 C3H8
18 C2H5
19 C3H8O
20 a 2NO + O2 → 2NO2
b C3H8 + 5O2 → 3CO2 + 4H2O c CaCO3 + 2HCl → CaCl2 + CO2 + H2O d C2H5OH + 3O2 → 2CO2 + 3H2O e WO3 + 3H2 → W + 3H2O f 2H2O2 → O2 + 2H2O g 4CrO3 → 2Cr2O3 + 3O2
h Al4C3 + 6H2O → 3CH4 + 2Al2O3
i 8HI + H2SO4 → H2S + 4H2O + 4I2
j 4PH3 + 8O2 → P4O10 + 6H2O
21 a 0.2 mol b 0.05 mol c 0.01 mol d 0.9 mol e 0.6 mol f 3.6 × 10−3 mol
22 a 0.363 g b 2.67 g c 4.62 g d 2.97 g
23 a 80.0% b 94.7% c 65.1%
Chapter 11
Compound Relative molecular mass
SO2 64.06
NH3 17.04
C2H5OH 46.08
MgCl2 95.21
Ca(NO3)2 164.10
CH3(CH2)5CH3 100.23
PCl5 208.22
Mg3(PO4)2 214.25
Na2S2O3 158.10
CH3CH2CH2COOCH2CH3 116.18
2Compound Molar mass /
g mol−1
Mass / g Number of
moles / mol
H2O 18.02 9.01 0.500
CO2 44.01 5.00 0.114
H2S 34.08 3.41 0.100
NH3 17.04 59.6 3.50
Q 28.6 1.00 0.035 0
Z 51.6 0.0578 1.12 × 10−3
Mg(NO3)2 148.33 1.75 0.0118
C3H7OH 60.11 2500 41.6
Fe2O3 159.7 9.07 × 10−3 5.68 × 10−5
3 a 2.99 × 10−23 g b 2.83 × 10−23 g c 7.31 × 10−23 g
4 a 1.20 × 1024 b 4.82 × 1023
c 9.03 × 1022
5 a 2.41 × 1022
b 9.63 × 1023
c 5.42 × 1024
6 a 0.8 mol b 0.7 mol c 0.12 mol
7 a 34.72% b 43.19% c 61.24%
8 a 1.60 g b 2.50 g c 5.64 g
2 CHEMISTRY FOR THE IB DIPLOMA © CAMBRIDGE UNIVERSITY PRESS 2011ANSWERS TO TEST YOURSELF QUESTIONS 1
24 a H2SO4
b H2O c HNO3
d NaCl
25 0.15 g
26 3.10 tonnes
27 a 200 cm3 b 1.6 dm3
28 a 0.0107 molb 0.0893 molc 4.46 × 10−3 mol
d 0.017 86 mole 0.011 16 mol
29 a 2.24 dm3
b 2240 dm3
c 6.05 dm3
d 19.04 dm3
e 13.4 dm3
30 108 cm3
31 1890 cm3
32 0.4732 g
33 a 290 cm3
b 300 cm3
34 21.7 cm3
35 196 °C
36 0.0655 mol
37 43.2 g mol−1
38 28.2 dm3
39 a 0.112 dm3
b 560 cm3
40 0.782 g
41 a 3.55 gb 0.200 mol dm−3
42 a 4.40 × 10−3 molb 2.34 × 10−3 mol
c 0.0108 mol
43 0.475 mol dm−3
44 a 1.25 gb 0.280 dm3
45 42.8 cm3
46 56.0 cm3