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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