A gas mixture in a container has a total pressure of 800 kPa...

Question Analysis
This question assesses the student's ability to use Dalton’s Law of Partial Pressures to find the partial pressure of an unknown gas in a mixture when the total pressure and other partial pressures are known.

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: 800 kPa.
2. Identify the known partial pressures: 300 kPa and 250 kPa.
3. Subtract the known partial pressures from the total pressure:

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