What fraction of the total pressure is exerted by oxygen, if equal weights of oxygen and methane are mixed in an empty vessel at 25°C ?
Correct answer: C. 1/3
- A. 2/3
- B. 1/2
- C. 1/3
- D. 1/3 × (298/273)
Explanation
For equal masses, methane produces twice as many moles as oxygen because its molecular weight is 16 compared with oxygen’s 32. Thus the mole fraction, and therefore pressure fraction, of oxygen is 1/(1+2) = 1/3.
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