What Volume of Ethanol (Density = 0

question 91

Multiple Choice

What volume of ethanol (density = 0.7893 g/cm³) should be added to 450. mL of water in order to have a solution that freezes at -15.0°C? Assume the density of water is 1.0 g/mL. (For water, K_f = 1.86 °C/m.)

• A) 371 mL
• B) 470 mL
• C) 212 mL
• D) 132 mL
• E) 167 mL

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Definitions:

Dependent Variable

The outcome variable in an experiment or study that researchers wish to explain or predict, which changes in response to the independent variable.

Explanatory Variables

Variables in a statistical model that are used to explain variations in the dependent variable; also known as independent variables.

Qualitative Predictor Variables

Variables that categorize or describe data based on attributes or qualities, such as gender, color, or type, which do not have a numerical value.

Dummy Variables

Numerical variables used in regression analysis to represent subgroups of the sample in a study.