Chemistry Reference
In-Depth Information
We are ready to solve the problem.
A sample of argon has a volume of 4.21 L at 34.0
o
C 307 K and
1.13 atm. If the pressure is allowed to decrease to 1.00 atm, at what
temperature will this gas occupy 5.00 L?
Given: V
1
= 4.21 L; T
1
= 307 K; P
1
= 1.13 atm; V
2
= 5.00 L;
P
2
= 1.00 atm
Find: T
2
Formula:
(5.00 L)(1.00 atm)(307 K)
(4.21 L)(1.13 atm)
T
2
=
V
2
P
2
T
1
=
= 322.66 K = 323 K
V
1
P
1
When doing these practice problems, remember to change
o
C to Kelvin,
and make sure that you label each quantity correctly. Pay attention to the
initial (V
1
, T
1
, and P
1
) and final (V
2
, T
2
, and P
2
) conditions.
Lesson 8-5 Review
1.
A sample of neon occupies 7.6 L at 23.0
o
C and 1.12 atm. What would
be the volume of this gas at STP?
2.
A sample of hydrogen has a volume of 250. cm
3
at STP. What would
be the volume of this gas at 359 K and 89.9 kPa?
3.
A sample of oxygen has a volume of 5.56 dm
3
at 15.0
o
C and 755 mm
of Hg. If the gas were allowed to cool to -11.0
o
C, at what pressure
would it occupy 5.00 dm
3
?
4.
A student collects a 5.00 × 10
2
cm
3
sample of hydrogen gas at 22.5
o
C
and 103.3 kPa of pressure. How much space would this gas occupy at
STP?
5.
A sample of carbon dioxide occupies 2.75 L at 43.5
o
C and 733 mm of
Hg. How much space would this gas occupy at STP?
Lesson 8-6: Graham's Law
In order to smell something, molecules must come off that substance
and enter your nose. When a woman who is wearing perfume enters a room,
molecules of that perfume must leave her skin and travel to your nose in
order for you to smell it. These molecules will not just leave her skin and
travel in a straight path to your nose; rather, they diffuse, or spread out in
