40 gms each of the methane and oxygen are mixed in an empty container maintained at 40°C. The fraction of the total pressure exerted by oxygen is_________________?
Correct answer: B. 1/3
- A. 1/2
- B. 1/3
- C. 1/4
- D. 2/3
Explanation
At the same temperature and volume, pressure fraction equals mole fraction. Methane gives 40/16 = 2.5 mol and oxygen gives 40/32 = 1.25 mol, so oxygen contributes 1.25/(3.75) = 1/3 of the total pressure.
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