Calculate the Mass of Lactose, C₁₂H₂₂O₁₁, Contained in 500

question 1

Multiple Choice

Calculate the mass of lactose, C₁₂H₂₂O₁₁, contained in 500.0 mL of solution if the measured vapour pressure of the solution is 121.2 mbar at 50 °C. The vapour pressure of pure water at 50 °C is 123.3 mbar; assume no change in volume occurs upon dissolution.

• A) 118 g
• B) 165 g
• C) 239 g
• D) 94.6 g
• E) 280 g

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