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

question 6

Multiple Choice

Sand is converted to pure silicon in a three step process.The third step is
SiCl₄(g) + 2Mg(s) $\to$ 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 \(\times\) l0⁴ kJ
• D)-3.13 \(\times\) 10⁴ kJ
• E)None of these choices is correct.

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