Question 11.10: INTERPRETING VAPOR PRESSURE CURVES The following diagram sho...

INTERPRETING VAPOR PRESSURE CURVES

The following diagram shows a close-up view of part of the vapor-pressure curves for two pure liquids and a mixture of the two. Which curves represent pure liquids, and which represents the mixture?

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The vapor pressure of a mixture of two volatile liquids is always intermediate between the vapor pressures of the two pure liquids. Thus, the top (red) and bottom (blue) curves represent pure liquids, and the middle curve (green) represents the mixture.

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