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

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.

Correct Answer:

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