A Solution Is Prepared by Adding 40

question 53

Multiple Choice

A solution is prepared by adding 40.00 g of lactose (milk sugar) to 110.0 g of water at 55 °C The partial pressure of water above the solution is ________ torr. The vapor pressure of pure water at 55 °C is 118.0 torr. The MW of lactose is 342.3 g/mol.

• A)2.216
• B)125.5
• C)225.9
• D)115.8
• E)86.5

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Definitions:

Hard Water

Water that contains high levels of calcium and magnesium ions, which can reduce the effectiveness of soap and leave deposits.

Micelle

A spherical aggregate of surfactant molecules formed in a liquid colloid, important in various chemical and industrial processes.

Emulsion

A mixture of two or more liquids that are normally immiscible, with one liquid containing a dispersion of the other.

Phospholipids

A group of lipids essential to all cell membranes for their ability to create lipid bilayers.