At , the total vapour pressure (in mm Hg) of a methanol-ethanol solution is represented by the linear equation , where is the mole fraction of methanol. What is the vapour pressure of pure methanol ()

Question

At $323	ext{ K}$, the total vapour pressure (in mm Hg) of a methanol-ethanol solution is represented by the linear equation $P = 120 X_A + 140$, where $X_A$ is the mole fraction of methanol. What is the vapour pressure of pure methanol ($P^0_A$) at this temperature?

Prashant Kotian · Accepted Answer

Correct answer: C. The total pressure equation is . To find the pure vapour pressure of methanol (), we take the limit as its mole fraction . Substituting gives .

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