ANSWERS TO 10
Answers to exercises
1.1.2 Exercise 1
1. a) 1.51 x 1022 b) 3.42 x 1022 c) 1.45 x 1022 d) 2.15 x 1024
2. a) 11.7 g b) 110 g c) 8.07 mg
3. 1.06 g
4. 729 g
5. 43.3 g, 11.0 g
6. 8.48 g, 9.81 g
1.1.2 Exercise 2
Using molarities and concentrations:
1. 0.025 2. 5.0 x 10-3 3. 0.079 g 4. 0.994 g
5. 0.043 moldm-3 6. 0.24 moldm-3 7. 0.0214 mol
Reacting masses and solutions:
1. 0.05 moldm-3 2. 0.092 moldm-3 3. 1.04 moldm-3 4. 459 cm3
5. 85.2, Rb
1.1.2 Exercise 3
1. a) 2.93 dm3, b) 0.731 dm3, c) 3.66 dm3 2. 37.2 cm3
3. a) 51.8 cm3, b) 43.3 g, c) 3.85 dm3 4. 0.098 g, 4.04 cm3
5. a) 280 cm3, b) 0.22 moldm-3
1.1.2 Exercise 4
1. C3H6O 2. C2H5Br 3. C4H8 4. C8H18 5. C6H6 6. Fe2O3
7. 16.6 % Si, 83.4 % Cl 8. 327 kg
1.1.3 Exercise 1
1. x = 2 2. Ca(NO3)2.4H2O 3. X = Na 4. x = 5 5. x = 7
6. x = 7
1.1.3 Exercise 2
1. 0.05 moldm-3
2. 0.092 moldm-3
3. 0.06 moldm-3
4. n = 2
5. x = 10
6. 1.80 moldm-3, 108 gdm-3
7. n = 2
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