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Partial pressure (MC)

Page history last edited by Joe Redish 6 years, 4 months ago

7.1.P3

 

Useful reading:

 

A box of gas of volume V contains a mixture of two different gases G1 and G2, as shown in the figure as red and blue molecules. The temperature is fixed at T with the two gases at thermal equilibrium. The G1 molecules have 1/2 the mass of the G2 molecules and there are twice (2N) as many G1 molecules as G2 molecules (N). In this problem, when we refer to to the molecules of a particular type (e.g., "the Gmolecules"), we mean all of them (not each individual one of them).


1) Which molecules contribute more to the force exerted on the top walls of the box?

  1. The G1 molecules
  2. The G2 molecules
  3. Both contribute equally
  4. None of the above
 

 

2) How much does each gas contribute to the pressure in the container?

  1. The G1 molecules exert half the pressure exerted by the G2 molecules
  2. The G1 molecules exert twice the pressure exerted by the G2 molecules
  3. Both G1 and G2 molecules exert the same amount of pressure
  4. None of the above

 

3) If the absolute temperature were doubled, what would happen to the average molecular speed of the gases?

  1. It doubles
  2. It goes up by more than 100%
  3. It goes up by a factor between 1.5 and 2
  4. It goes up by a factor between 1 and 1.5
  5. There is not enough information to tell

 

4) When the temperature is doubled, which of the gas molecules speeds up by a larger factor?

  1. The G1 molecules
  2. The G2 molecules
  3. Both speed up by the same factor
  4. None of the above
  5. Not enough information

 

Next, 3N molecules of a third gas G3 are added to the container, which is maintained at the original temperature and volume. If the G3 molecules have twice the mass of the G1 molecules,

 

5) What happens to the total pressure exerted by the gas?

  1. The pressure doubles
  2. The pressure is halved
  3. The pressure remains the same
  4. The pressure increases by a factor between 1 and 2
  5. None of the above

 

6) How will the partial pressures exerted by each of the species compare, if P is the total pressure exerted by the mixture?

  1. PG3 = P/2; PG2 = P/6; PG1 = P/3
  2. PG3 = P/3; PG2 = P/3; PG1 = P/3
  3. PG3 = P/2; PG2 = P/3; PG1 = P/6
  4. None of the above

 

 

Arpita Upadhyaya and Joe Redish 4/17/14 

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