The integrated circuits in your cell phone and computer are made from the semiconductor silicon. The silicon is obtained from a really inexpensive starting material, sand, which is primarily SiO2. One step in the purification of silicon is to separate it from solid impurities by forming the gas silicon tetrachloride. Given the following reactions, which are performed one at a time, what is the overall enthalpy change in converting 1.00 mol of silicon dioxide into pure silicon?   Reaction ΔH° (kJ) SiO2(s) + 2C(s) → Si(impure s) + 2CO(g) +690 Si(impure s) + 2Cl2(g) → SiCl4(g) −657 SiCl4(g) + 2Mg(s) → 2MgCl2(s) + Si(s) −625     Select one: a. −592 kJ b. −1,972 kJ c. +592 kJ d. −625 kJ e. +1,972 kJ

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Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
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Chapter1: Chemical Foundations
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The integrated circuits in your cell phone and computer are made from the semiconductor silicon. The silicon is obtained from a really inexpensive starting material, sand, which is primarily SiO2. One step in the purification of silicon is to separate it from solid impurities by forming the gas silicon tetrachloride. Given the following reactions, which are performed one at a time, what is the overall enthalpy change in converting 1.00 mol of silicon dioxide into pure silicon?

 
Reaction
ΔH° (kJ)
SiO2(s) + 2C(s) → Si(impure s) + 2CO(g)
+690
Si(impure s) + 2Cl2(g) → SiCl4(g)
−657
SiCl4(g) + 2Mg(s) → 2MgCl2(s) + Si(s)
−625
   
Select one:
a. −592 kJ
b. −1,972 kJ
c. +592 kJ
d. −625 kJ
e. +1,972 kJ
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