A mixture of Xe,Kr,and Ar has a total pressure of 6.69 atm.What is the mole fraction of Kr if the partial pressures of Xe and Ar are 1.92 atm and 2.75 atm,respectively.
A)0.302
B)0.287
C)0.411
D)0.259
E)0.698

Question

Quizplus · Accepted Answer

The total pressure of the mixture is the sum of the partial pressures of each gas. The partial pressure of Kr can be found by subtracting the partial pressures of Xe and Ar from the total pressure: 6.69 atm - 1.92 atm - 2.75 atm = 2.02 atm. The mole fraction of Kr is then the partial pressure of Kr divided by the total pressure: 2.02 atm / 6.69 atm = 0.302.

A Mixture of Xe,Kr,and Ar Has a Total Pressure of 6.69