A Sample of Helium Occupies 44

question 5

Multiple Choice

A sample of helium occupies 44.8 L at STP.What is the mass of the sample?

• A) 2.00 g
• B) 4.00 g
• C) 8.00 g
• D) 16.0 g

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Definitions:

Osmotic Pressure

The pressure that must be applied to a solution to prevent the inward flow of water across a semipermeable membrane, related to the concentration of solutes.

Guard Cells

Specialized cell pairs that flank stomatal pores on plant leaves, regulating the opening and closing of the pores to control gas exchange and water loss.

Casparian Strip

A band of cell wall material found in plant roots that is impervious to water and solutes, ensuring that all materials pass through a cell membrane before entering the plant.

Endodermal Cells

Cells that form the endoderm, the innermost layer of the embryo, giving rise to the lining of the digestive and respiratory tracts.