Multiple Choice
If the partial pressure of a gas in a mixture has declined to one third of its initial value, what is the new partial pressure if the initial pressure was 90 kPa?
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7. Gases
Partial Pressure
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Which gas has the greatest partial pressure in inspired air?
A
Carbon Dioxide (CO2)
B
Oxygen (O2)
C
Nitrogen (N2)
D
Argon (Ar)
Verified step by step guidance1
Understand the concept of partial pressure: In a mixture of gases, each gas exerts a pressure independently of the others. This is known as the partial pressure of the gas.
Recall Dalton's Law of Partial Pressures: The total pressure of a gas mixture is the sum of the partial pressures of each individual gas in the mixture.
Consider the composition of air: Air is primarily composed of nitrogen (N2), oxygen (O2), argon (Ar), and carbon dioxide (CO2).
Identify the proportion of each gas in air: Nitrogen makes up about 78% of air, oxygen about 21%, argon about 0.93%, and carbon dioxide about 0.04%.
Determine which gas has the greatest partial pressure: Since nitrogen constitutes the largest percentage of air, it has the greatest partial pressure according to Dalton's Law.
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