At a given temperature,the vapor pressures of hexane and octane are 183 mm Hg and 59.2 mm Hg,respectively.Calculate the total vapor pressure over a solution of hexane and octane.The mole fraction of hexane (X_hexane)is 0.580. A) 106 mm Hg B) 121 mm Hg C) 131 mm Hg D) 242 mm Hg

Question

Quizplus · Accepted Answer

The total vapor pressure is given by the equation: Ptotal = X_hexaneP1 + (1 - X_hexane)P2 where P1 and P2 are the vapor pressures of hexane and octane, respectively. Substituting the given values: Ptotal = (0.580)(183 mm Hg) + (1- 0.580)(59.2 mm Hg) Ptotal = 106.14 mm Hg ≈ 131 mm Hg Therefore, the best choice is C.

At a Given Temperature,the Vapor Pressures of Hexane and Octane