What Is the Vapor Pressure of Water Above a Solution

question 187

Multiple Choice

What is the vapor pressure of water above a solution prepared by adding 15.0 grams of lactose (C₁₂H₂₂O₁₁) to 100.0 grams of water at 338 K. Molar Mass(C₁₂H₂₂O₁₁) = 342.3 g/mol and Molar Mass(H₂O) = 18.015 g/mol; P ° _H2O(338 K) = 187.5 torr.

• A) 1.50 torr
• B) 9.38 torr
• C) 24.5 torr
• D) 163 torr
• E) 186 torr

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