Chemistry Reference
In-Depth Information
16. Under identical conditions of temperature and pressure, which of the
following gases will diffuse most quickly?
a) H b) Ne c) CO d) O
2
17. A sample of hydrogen gas is collected by displacing water at a
temperature of 25.0
o
C. The pressure of the resultant mixture is
85.5 kPa. What is the partial pressure exerted by the water vapor in
the mixture?
a) 3.17 kPa b) 85.5 kPa c) 88.6 kPa d) 82.3 kPa
18. A sample of hydrogen gas is collected by displacing water at a
temperature of 25.0
o
C. The pressure of the resultant mixture is
85.5 kPa. What is the partial pressure exerted by the dry hydrogen
gas?
a) 3.17 kPa b) 85.5 kPa c) 88.6 kPa d) 82.3 kPa
19. A sample of neon occupies 3.49 dm
3
at 111 K and 0.98 atm. Which
formula can be used to determine the volume that this gas would
oc
c
upy at STP?
a)
V
=
M
V
1
T
1
V
2
T
2
V
1
P
1
T
2
P
2
T
1
b)
c)
d)
P
1
V
1
= P
2
V
2
1
2
=
V
2
=
V
M
2
1
20. What is the density of argon gas at STP?
a) 22.4 dm
3
/mol b) 39.9 g/mol
c) 1.12 g/dm
3
d) 1.78 g/dm
3
Part III—Calculations
Perform the following calculations.
21. How many moles of nitrogen (N
2
) gas would occupy 3.75 dm
3
at
23.0
o
C and 1.45 atm?
22. A sample of argon gas occupies 350 cm
3
at 750 mm of Hg. Assuming
the temperature of the gas remains constant, what will be the volume
of this gas at 1120 mm of Hg?
23. Calculate the relative rate of diffusion for argon and neon gas under
identical conditions of temperature and pressure.
24. Calculate the volume that a sample of helium gas will occupy at
45.0
o
C, if it occupies 0.993 L at 19.0
o
C. Assume the pressure of the
gas is constant.
