What Mass of Ethanol, C₂H₅OH a Nonelectrolyte, Must Be Added

question 91

Multiple Choice

What mass of ethanol, C₂H₅OH a nonelectrolyte, must be added to 10.0 L of water to give a solution that freezes at -10.0°C? Assume the density of water is 1.0 g/mL. K_f of water is 1.86°C/m.

• A)85.7 kg
• B)24.8 kg
• C)5.38 kg
• D)2.48 kg
• E)1.17 kg

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Definitions:

Guard Cells

Specialized cells in the epidermis of leaves, stems, and other organs that regulate gas exchange and water loss by controlling the opening and closing of stomata.

Stomata

Tiny openings or pores found in the epidermis of leaves and stems that allow for gas exchange between the plant and its environment.

Palisade Mesophyll

The layer of closely packed cells in a plant leaf where most photosynthesis occurs.

Upper Epidermis

The outermost layer of cells in the upper part of a plant leaf or stem, serving as a protective barrier against the environment.