Sand Is Converted to Pure Silicon in a Three Step

question 55

Multiple Choice

Sand is converted to pure silicon in a three step process. The third step is SiCl₄(g) + 2Mg(s) → 2MgCl₂(s) + Si(s) ΔH = −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 × 10 ⁴ kJ
• D)−3.13 × 10 ⁴ kJ
• E)None of these choices are correct.

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