Exhibit 21-3 The Following Question(s) Pertain to Iron Which Has a Body-Centered

question 15

Multiple Choice

Exhibit 21-3
The following question(s) pertain to Iron which has a body-centered cubic unit cell. It has a molar mass of 55.847 g·mol^-1 and a density of 7.86 g·cm^-3.
Refer to Exhibit 21-3. What is the radius of a single iron atom?

• A) 2.55 Å
• B) 1.24 Å
• C) 1.94 Å
• D) 1.05 Å

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Definitions:

Degrees of Freedom

Refers to the number of independent values or quantities that can vary in an analysis without violating any constraints.

Number

A mathematical object used to count, measure, and label.

Chi-Squared Distribution

A probability distribution widely used in inferential statistics for hypothesis testing and in constructing confidence intervals, especially useful for categorical data.

Degrees of Freedom

The number of independent pieces of information available to estimate another piece of information or the parameters in a statistical model.