Adv Chem Practice Problems - Gases
Student Name:
1. a)
Your sample of gas has the higher pressure.
2. c)
1:4
3. e)
1 : 2 (very advanced question – number of collisions is a function of how many moles in
your sample and how fast they are moving; how fast they are moving is determined by root mean
square velocity and is therefore proportional to the square root of temperature if the samples are
identical. So, while there are 4 times as many moles of sample #2, the velocity of sample #1 is
twice as fast; therefore, there are 2 times the number of collisions for sample #2 relative to sample
#1 – PS – this took two Ph.D. chemists 10 minutes to figure out, so NO you will not be asked to
think through problems this complicated on your test!)
4. c)
7 atm
5. b)
Your friend should release the Cl2 first.
6. b)
Cl2
7. a)
He
8. e)
all gases the same
9. b)
Cl2
10. e)
all gases the same
11. e)
all gases the same
12. e)
low P, high T, low n
13. a)
89.6 g/mol
14. c)
101 L
15. b)
5.00 L, 0.00 L, 5.00 L, 30.0 L
16. d)
4.9 atm
17. a)
Gas particles have most of their mass concentrated in the nucleus of the atom.
18. d)
The mean square velocity of molecules in sample A is twice as large as the mean square
velocity of molecules in sample B.
19. b)
the finite volume of molecules
20. e)
None of these.
21. b)
11.2 L
22. d)
all are the same
23. c)
flask C
24. a)
0.67
25. c)
22.4 L