The partial pressure of oxygen in a sample of air is 452 mm Hg and the total pressure is 780 mm Hg. What is the mole fraction of oxygen?

  • A 0.203
  • B 0.579
  • C 2.030
  • D 5.790
jamb 2000chemistry

The correct answer is B. 0.579

Mole fraction = \(\frac{\text{Partial pressure of component}}{\text{Total pressure of compound}}\)

= \(\frac{452}{780}\)

= 0.579

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