For the reaction Si(s) + O2(g) --> SiO2(s): Write the balanced half cell redox r

Question

For the reaction Si(s) + O2(g) --> SiO2(s): Write the balanced half cell redox reactions that could be used to measure the Ecell and Delta G. Label the oxidation and reduction half cell reactions For the reaction Si(s) + O2(g) --> SiO2(s): Write the balanced half cell redox reactions that could be used to measure the Ecell and Delta G. Label the oxidation and reduction half cell reactions Write the balanced half cell redox reactions that could be used to measure the Ecell and Delta G. Label the oxidation and reduction half cell reactions

Explanation / Answer

the potentials available

SiO2(s) + 4 H+ + 4 e Si(s) + 2 H2O 0.91

O2(g) + 2 H2O + 4 e 4 OH(aq) +0.401

add both equations:

invert (1)

Si(s) + 2 H2O SiO2(s) + 4 H+ + 4 e E = 0.91 this is going to OXIDIZE

O2(g) + 2 H2O + 4 e 4 OH(aq) +0.401 This is going to REDUCE

Add all

O2(g) + 2 H2O + 4 e + Si(s) + 2 H2O SiO2(s) + 4 H+ + 4 e + 4 OH(aq) Etotal = 0.91 + 0.401 = 1.311

cancel common terms

O2(g) + 4H2O + Si(s) SiO2(s) + 4H2O(l) Etotal = 0.91 + 0.401 = 1.311

cancel water

O2(g) + Si(s) SiO2(s) Etotal = 1.311

for dG:

dG = -nF*E°cell

we know E|cell = 1.311

dG = -nF*E°cell

n = 4 elecxtrons transfer , F = 96500,

dG = -4*96500 * 1.311 = -506046 J/mol

Related Questions

Navigate

• Browse (All)
• Browse F
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.