# Problem: The third step in converting SiO2  to Si is:SiCl4 (g) + 2Mg(s) → 2MgCl2 (s) + Si(s) ΔH = -625.6 kJ. What is the enthalpy change when 4.248 kg of silicon tetrachloride (MW = 169.9 g/mol) is converted to elemental silicon?

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The third step in converting SiO2  to Si is:

SiCl4 (g) + 2Mg(s) → 2MgCl2 (s) + Si(s) ΔH = -625.6 kJ.

What is the enthalpy change when 4.248 kg of silicon tetrachloride (MW = 169.9 g/mol) is converted to elemental silicon?

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Our tutors have indicated that to solve this problem you will need to apply the Thermochemical Equation concept. You can view video lessons to learn Thermochemical Equation. Or if you need more Thermochemical Equation practice, you can also practice Thermochemical Equation practice problems.

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