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?
7. Gases
Partial Pressure
Struggling with General Chemistry?
Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
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.
0:44mWatch next
Master Law of Partial Pressures with a bite sized video explanation from Jules
Start learningRelated Videos
Related Practice
Partial Pressure practice set
Problem sets built by lead tutorsExpert video explanations