Answers to Chapter 7 HW
**It is your responsibility to correct your own HW if it was graded honest attempt.
**If you find any discrepancies, see me with the problem.
Page 1
1. atm or kPa
2. /760
3. leave it alone
4. leave it alone
5. L
6. Change to L /1000
7. Leave alone
8. K
9. +273
10. leave alone
11. .0821 Latm/mol K
12. 8.314 LkPa/mol K
13. 273K
14. 1.00 atm OR 101.325 kPa
15. 22.4 L
page 2 skip notes
Page 3
WS Gas Problems Ideal Gas Law Review
1. 5.01 g CO2
2. 4.53 g
3. 7.36 x 1022 molecules
4. .0826 moles
5. 4.16 L of O2 at .550 atm and 283 K
Page 4 and 5 skip notes
Page 6,7,8 (side by side notes you already have these on a separate sheet)
Page 9
WS Gas Stoichio @STP
1. 3.83 L of H2
2. 2.06 L of H2
3. .0494 moles H2
4. 102 L of Cl2
5. 1.25 g H2O
page 10
WS Gas Stoichio NOT @ STP
1. 10.1 L and 11.1 L @755mmHg and 298K
2. .0389 g of Mg
3. .174 mol F2
4. 19.3 g of O2
5. 20.3 L of H2 @ 25C and 755mmHg
page 11
WS Gas Problems Practice
1. .0478 g of Mg
2. 4.75 L of H2
3. 1.5 L of H2 @ 15C and 725 mmHg
4. 36.34 L @ 35C and 740. mmHg
5. 8.563 L of H2 @STP
6. 6.9 L of Cl2 @ STP
7. 14.6 L @25C and 103.8 kPa
8. 1.25 g of H2O
9. 79 g of Mg
page 12
WS Gases
1. 13.4 g
2. 12.2 g
3. 93.86 x 1022 molecules
4. .683 moles
5. 291.2 L
6. 864.5 L
7. .1071 g
8. 7.134 g/L
9. 18 g/mol
10. 2.93 x 1023 molecules
page 13
WS Gases
1. 40.1 L of F2
2. 12.8 L of CO2
3. .100 L of NH3
4. 5.25 L of O2
5. .250 L of H2O
page 14
1.
2.
3.
4.
5.
skip
skip
same temp so same Kinetic energy but lighter molecules move faster
the collisions of molecules with the wall
increase temp, then increase kinetic energy then more collisions so increase
pressure and increased volume
page 15
6. .47 L CO2
7. 78855 mL
8. 41.87L
9. 5.49g
page 16
1. 10.4 L
2. 39.8L
3. 30.4 atm
4. 4.10 g HBr
5. .613 g
page 17
6. .269 atm
7. 25.5 g
8. 3.58 g
9. 265 mL
10. 47.2 L
11. .612 mol MgO
page 18
12. 2.77 g/L
13. .0699 mol
14. 56.9 L H2O
15. .910 L
16. 23.0 L NH3
17. 4.37 g N2
page 19
18. 13.7 L O2
19. 5.92 g O2
20. 2.86 g/L
21. 1.20x 1024 atoms Ne
22. 31.9 mL
page 20 Notes: The kinetic molecular theory
1. explain, describe
2. explanation, behave
3. tiny particles, small distances, volume negligible, constant random motion
container, attract repel, kinetic energy directly proportional, Kelvin
4. temperature, motion
5. n (quantity), temp, kinetic energy, collisions, pressure
6. n, increase, kinetic energy, collisions, pressure, expland, volume
7. increased, decrease, collisions, away, decrease
page 21 Calculations Ideal Gas Law and Combined Gas Law
1. 9.81 atm
2. 45.8 L
3. .191 moles
4. 667K
5. .173 atm
page 22
6. .08282L
7. .0575 mol
8. .844 L
9. 94.0 kPa
10. 305 K