Consider an ideal solution of 2 components in the liquid and vapor phases, A and
ID: 493210 • Letter: C
Question
Consider an ideal solution of 2 components in the liquid and vapor phases, A and B. The purecomponent vapor pressures of A and B are 1000 and 2000 Pa, respectively. If the vapor mole fraction of A is 0.4
Consider an ideal solution of 2 components in the liquid and vapor phases, A and B. The pure component vapor pressures of A and Bare 1000 and 2000 Pa, respectively. If the vapor mole fraction of A is 0.4 a) Calculate the total vapor pressure above this ideal solution in Pascals. b) Calculate the liquid mole fraction of B.Explanation / Answer
Molefraction of all the components is unity.
XA + XB = 1
XB = 1 - 0.4 = 0.6
Total vapor pressure = Partial pressure of A + Partial pressure of B
Partial pressure of A = XA *1000 = 0.4*1000 = 400 Pa
Partial pressure of B = XB *1000 = 0.6*2000 = 1200 Pa
Total vapor pressure = 400+1200 = 1600 Pa