Most Integrated Circuits Are Made from Silicon, Which Can Be

Most integrated circuits are made from silicon, which can be obtained from an inexpensive starting material, SiO₂.One step in the purification of silicon is to separate it from solid impurities by forming silicon tetrachloride gas.Given the following reactions, what is the overall enthalpy change in converting 1.00 mol of silicon dioxide into pure silicon?

A) (+1972 kJ)
B) (-1972 kJ)
C) (-592 kJ)
D) (+592 kJ)
E) (-625 kJ)