Sand Is Converted to Pure Silicon in a Three-Step Process

question 94

Multiple Choice

Sand is converted to pure silicon in a three-step process. The final step in this process is as follows. SiCl₄(g) + 2Mg(s) → 2MgCl(s) + Si(s) ΔH°_rxn = -625.6 kJ/mol
What is the enthalpy change if 25.0 mol of silicon tetrachloride is converted to elemental silicon?

• A) -25.0 kJ
• B) -626 kJ
• C) -1.56 × l0⁴ kJ
• D) -3.13 × 10⁴ kJ
• E) -3.13 × 10³ kJ

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Definitions:

Sampling Distribution

The likelihood distribution of a statistical measurement derived from numerous samples taken from a particular group of individuals or items.

Confidence Interval

A band of values gathered from sample data, which potentially contains the value of an undisclosed population attribute.

Sampled Population

The segment of the population from which the sample is taken for the purpose of a statistical study.

Population Mean

The average value of a population attribute or variable, calculated by summing all values in the population and dividing by the total number of values.