In a gas mixture, the partial pressure of nitrogen (N₂) is 4...

Question Analysis
This question evaluates the student's ability to apply Dalton’s Law of Partial Pressures to determine the partial pressure of a specific gas in a mixture when the total pressure and the partial pressures of other gases are given.

Key Concept Explanation
Dalton’s Law of Partial Pressures states that the total pressure of a gas mixture is the sum of the partial pressures of each individual gas in the mixture.

Step-by-step Solution
1. Identify the total pressure of the gas mixture: 700 kPa.
2. Identify the partial pressures of nitrogen and oxygen: 400 kPa and 200 kPa, respectively.
3. Subtract the partial pressures of nitrogen and oxygen from the total pressure:

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