Sand Is Converted to Pure Silicon in a Three Step $\rightarrow$

question 25

Multiple Choice

Sand is converted to pure silicon in a three step process. The third step is SiCl₄(g) + 2Mg(s) $\rightarrow$ 2MgCl₂(s) + Si(s) , $\Delta$ H = -625.6 kJ
What is the enthalpy change when 25.0 mol of silicon tetrachloride is converted to elemental silicon?

• A) -25.0 kJ
• B) -7820 kJ
• C) -1.56 * 10⁴ kJ
• D) -3.13 * 10⁴ kJ
• E) None of these choices is correct.

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