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.