JAMB Chemistry 2020 Objective — Question 33
Question 33 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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33. 200cm3 of oxygen diffused through a porous plug in 50 seconds. How long will it take for 45cm3 of methane to diffuse through the same porous plug under the same conditions?
- A. A. 14sCorrect
- B. B. 20s
- C. C. 40s
- D. D. 69s
Explanation
By Graham's law, rate ∝ 1/√M. Using the ratio of volumes and molar masses of O2 (32) and CH4 (16), the time for 45cm3 of methane works out to approximately 14 seconds.
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