A mixture of the three gases, oxygen, nitrogen and argon, is at a total pressure of 500 kPa. There is a total of 1.2 moles of gas in the mixture. If the oxygen gas alone occupied the entire volume of the mixture, it would exert a pressure of 150 kPa. At room conditions the amount of nitrogen gas in the mixture would occupy a volume of 5.76 dm³. What is the partial pressure of the argon gas in the mixture?

Q: What topic does this question test?

This question tests States of matter in A-Level Chemistry (syllabus code 9701). It is worth 1 mark.

Q: Which exam paper is this question from?

This question appeared in the Cambridge A-Level Chemistry Oct/Nov 2023 examination, Paper 1 Variant 2 (9701_w23_qp_12.pdf).

Question

A mixture of the three gases, oxygen, nitrogen and argon, is at a total pressure of 500 kPa. There is a total of 1.2 moles of gas in the mixture. If the oxygen gas alone occupied the entire volume of the mixture, it would exert a pressure of 150 kPa. At room conditions the amount of nitrogen gas in the mixture would occupy a volume of 5.76 dm³. What is the partial pressure of the argon gas in the mixture?

Oracle Prep · Accepted Answer

The correct answer is C: 250 kPa.

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