A 255 ML Round-Bottom Flask Is Weighed and Found to Have

question 103

Multiple Choice

A 255 mL round-bottom flask is weighed and found to have a mass of 114.85 g. A few milliliters of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling water bath. All of the liquid vaporizes at the boiling temperature of water, filling the flask with vapor. When all of the liquid has vaporized, the flask is removed from the bath, cooled, dried, and reweighed. The new mass of the flask and the condensed vapor is 115.23 g. Which of the following compounds could the liquid be? (Assume the ambient pressure is 1 atm.)

• A)C₄H₁₀
• B)C₃H₇OH
• C)C₂H₆
• D)C₂H₅OH
• E)C₄H₉OH

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Definitions:

Main Effects

The direct impact of an independent variable on a dependent variable in an experimental design, ignoring the effects of other variables.

Interactions

The reciprocal actions or influences between entities, such as between individuals, groups, or systems.

Factorial Design

An experimental setup that involves two or more independent variables, allowing researchers to study the interactive effects on a dependent variable.

Independent Variables

Factors manipulated by the researcher in an experiment to determine their effects on the outcome or dependent variables.