A Special Flask Used in the Determination of Densities, Called

question 27

Multiple Choice

A special flask used in the determination of densities, called a pycnometer, has a mass of 16.3179 g when empty, and it has a mass of 48.0250 g when filled with water at 20.0°C.When this same pycnometer is filled with ethyl alcohol at 20.0°C, it is found to have a mass of 41.3934 g.Find the density of ethyl alcohol at 20.0°C. (Given: at 20.0°C, the density of water is 0.9982 g/mL)

• A)0.7894 g/mL
• B)0.7923 g/mL
• C)0.7908 g/mL
• D)1.303 g/mL
• E)0.7674 g/mL

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Definitions:

Time Sampling

A behavioral observation technique that involves observing the presence or absence of behaviors within specific time intervals.

Frequency

The rate at which an event or behavior occurs over a specified period of time.

Anecdotal

Pertaining to a short and interesting story or personal account, often used as informal evidence to support a point.

Duration

The total time period during which an event or condition exists or persists.