At 20°C, a 2

question 43

Multiple Choice

At 20°C, a 2.32 M aqueous solution of ammonium chloride has a density of 1.0344 g/mL. What is the molality of ammonium chloride in the solution? The formula weight of NH₄Cl is 53.50 g/mol.

• A)2.55
• B)0.0449
• C)2.32
• D)0.446
• E)12.00

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Definitions:

Dementia

A decline in cognitive function beyond what might be expected from normal aging, affecting memory, thinking, orientation, comprehension, calculation, learning capacity, language, and judgment.

Dummy Variable

A variable used to model the effect of categorical independent variables. A dummy variable may take only the value zero or one.

Categorical Independent Variables

Variables that divide subjects into groups but do not allow for any kind of mathematical operation among groups.

Regression Model

The equation that describes how y is related to x and an error term; in simple linear regression, the regression model is y = b0 + b1x + e.