Worksheet: Mole Fractions from Partial Pressures

In this worksheet, we will practice using Dalton's law to convert between mole fractions and partial pressures.

Q1:

A gas mixture used for anesthesia contains 2.83 mol oxygen, O 2 , and 8.41 mol nitrous oxide, N O 2 . The total pressure of the mixture is 192 kPa.

What are the mole fractions of O 2 and N O 2 ?

  • A O 2 : 0.337, N O 2 : 0.663
  • B O 2 : 0.748, N O 2 : 0.252
  • C O 2 : 0.663, N O 2 : 0.337
  • D O 2 : 0.252, N O 2 : 0.748

What are the partial pressures of O 2 and N O 2 ?

  • A O 2 : 127 kPa, N O 2 : 64.6 kPa
  • B O 2 : 64.6 kPa, N O 2 : 127 kPa
  • C O 2 : 144 kPa, N O 2 : 48.3 kPa
  • D O 2 : 48.3 kPa, N O 2 : 144 kPa

Q2:

A mixture of hydrogen and oxygen gases is explosive if the oxygen content is more than 3 . 0 % m o l . In which of the following oxygen-hydrogen mixtures is the oxygen content closest to this threshold without exceeding it?

  • AA hydrogen partial pressure of 1 9 9 0 0 0 Pa and an oxygen partial pressure of 6 2 0 0 Pa.
  • BA total pressure of 59.00 bar and oxygen partial pressure of 1.500 bar.
  • CA hydrogen mass of 2.419 kg and an oxygen mass of 1.120 kg.
  • DA total pressure of 34.55 atm and hydrogen partial pressure of 33.55 atm.
  • EA total mass of 921.3 g and an oxygen mass of 307.2 g.

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