Chemistry Reference
In-Depth Information
25. A mixture of gases is made up of oxygen, hydrogen, and neon. If the
partial pressures exerted by each of these gases is 0.23 atm, 0.33 atm,
and 0.42 atm respectively, find the total pressure exerted by the
mixture.
Answer Key
The actual answers will be shown in brackets, followed by the explana-
tion. If you don't understand an explanation that is given in this section, you
may want to go back and review the lesson that the question came from.
Lesson 8-1 Review
1.
[barometer or closed manometer]—When you hear a meteorologist
referring to “barometric pressure,” he or she is talking about the pressure
exerted by the gases in our atmosphere.
2.
[pressure]—You may have used a pressure gauge to measure the pressure
of the air in your bicycle or car tires.
3.
[temperature, pressure]—Remember to report the temperature and
pressure of a gas sample when you report its volume.
101.3 kPa
atm
4.
[2.0 × 10
2
kPa]—
2.0 atm ×
= 202.6 kPa
which rounds to 2.0 × 10
2
kPa
7.5 mm of Hg
kPa
5.
[806.3 mm of Hg]—
107.5 kPa ×
= 806.25 mm of Hg
which rounds to 806.3 mm of Hg
1.0 atm
760 Torr
6.
[1.0 atm]—
790 Torr ×
= 1.03947 atm
which rounds to 1.0 atm
760 mm of Hg
1.0 atm
7.
[790. mm of Hg]—
1.04 atm ×
= 790.4 mm of Hg
which rounds to 790. mm of Hg
25.4 mm
1.0 inch
1.0 atm
760 mm of Hg
8.
[1.11 atm]—
33.2 inches of Hg ×
×
= 1.109578 atm
which rounds to 1.11 atm
9. [754 mm of Hg]—Remember, 1 mm of Hg = 1 Torr.
10. [E. Both A and D are correct]—Standard temperature is equal to 0
o
on the
Celsius scale, which is equal to 273 K (0 + 273 = 273).
Lesson 8-2 Review
1.
[Boyle's]—As the volume of a gas sample goes up, the pressure that it exerts
goes down.
