WAEC Chemistry 2022 Objective — Question 21
Question 21 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.
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What is the partial pressure of oxygen at s.t.p. in a gaseous mixture containing 100 cm³ of oxygen and 900 cm³ of nitrogen gas?
- A. 1.0 atm
- B. 0.1 atmCorrect
- C. 9.0 atm
- D. 0.9 atm
Explanation
Total volume = 100+900 = 1000 cm³. Since measured at s.t.p., total pressure = 1 atm. Partial pressure of oxygen = (100/1000) × 1 atm = 0.1 atm.
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