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 ΔΗ (kJ) SIO2(s) + 2C(s) Si(impure s) + 2CO(g) Si(impure s) + 2CI2(g) +690 SICI4(g) -657 SICI4(g) + 2Mg(s) → 2M9CI2(s) + Si(s) -625 Select one: a. +592 kJ b. -625 kJ C. +1,972 kJ d. -1,972 kJ e. -592 kJ

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 ΔΗ (kJ) SIO2(s) + 2C(s) Si(impure s) + 2CO(g) Si(impure s) + 2CI2(g) +690 SICI4(g) -657 SICI4(g) + 2Mg(s) → 2M9CI2(s) + Si(s) -625 Select one: a. +592 kJ b. -625 kJ C. +1,972 kJ d. -1,972 kJ e. -592 kJ

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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