MCAT General Chemistry Question 270: Answer and Explanation

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Question: 270

2. What is the partial pressure of nitrogen gas in the atmosphere at sea level?

  • A. 7.91 × 101 Pa
  • B. 5.96 × 102 Pa
  • C. 7.91 × 104 Pa
  • D. 5.96 × 105 Pa

Correct Answer: C

Explanation:

C The pressure at sea level is 1 atm ≈ 100 kPa = 1 × 105 Pa. According to Table 1, nitrogen comprises approximately 80 percent of atmospheric air, thus the partial pressure of nitrogen at sea level is approximately (0.8)(1 × 105 Pa) = 8 × 104 Pa.

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