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Question

In a mixture of N2 and CO2­ gases, the partial pressure of CO2 is 1.25 atm. The total pressure of the mixture is 5 atm.Find the mole fraction of N2 in the mixture.


  1. 0.82

  2. 0.75

  3. 0.80

  4. 0.65


Solution

The correct option is B

0.75


PN2=XN2×PT

PT=PCO2+PN2

5 = 1.25 + PN2

PN2 = 3.75 

3.75 = XN2×5

XN2=3.7550.75

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