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?

Question

Most integrated circuits are made from silicon,which can be obtained from an inexpensive starting material,SiO<sub>2</sub>.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

Quizplus · Accepted Answer

The overall enthalpy change is calculated by summing the enthalpy changes of the given reactions: +690 kJ - 657 kJ - 625 kJ = -592 kJ.

Most Integrated Circuits Are Made from Silicon,which Can Be Obtained