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States of Matter 1.12 Dalton-s Law of Partial Pressures Wiva k12 Chemistry
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States of Matter 1.12 Dalton-s Law of Partial Pressures Wiva k12 Chemistry
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States of Matter 1.12: Dalton's Law of PartialPressures Wiva k12 Chemistry
a.) 146.4 kPa - ✔✔At 298 K, you collect 0.5 L of oxygen over water that has a total pressure of 150
kPa. What is the partial pressure of oxygen? (The partial pressure of water vapor at 298 K is 3.6
kPa.)
a.) 146.4 kPa
b.) 150.4 kPa
c.) 154.6 kPa
d.) 298.6 kPa
a.) 558 kPa - ✔✔A mixture of Ar, He, and O2 has a total pressure of 1,015 kPa, and partial
pressures of argon and helium of 152 kPa and 305 kPa, respectively. What is the partial pressure of
oxygen in this mixture?
a.) 558 kPa
b.) 710 kPa
c.) 863 kPa
d.) 1,472 kPa
%
Although pure gases are used in many examples of the gas laws, many gases are actually mixtures.
For example, the air that we breathe is a mixture of 78% nitrogen, 21% oxygen, and 1% other gases
(carbon dioxide, argon, hydrogen, and others). Do mixtures of gases behave the same way as pure
gases?
In 1801, John Dalton addressed the issue of gas mixtures. He found the following:
-Gas mixtures behave the same way that pure gases do.
-Individual gases behave independently of the mixture.
-Individual gases contribute to the pressure of the mixture.
Dalton's findings have important implications in scuba diving, flying aircraft at high altitudes, mountain
climbing, and chemistry. - ✔✔Dalton addressed the issue of gas mixtures.
b.) 105 kPa - ✔✔At a depth of 40 m, the water pressure is 500 kPa. A diver breathing air (78% N2,
21% O2) at this depth would have what partial pressure of oxygen in his lungs?
a.) 5.1 kPa
b.) 105 kPa
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