Question

What is the cell potential for the reaction Mg(s)+Fe2+(aq)→Mg2+(aq)+Fe(s) at 47 ∘C when [Fe2+]= 3.10 M and [Mg2+]= 0.110 MM . Express the potential numerically in volts.

Answer #1

We need to use the following equation:

Ecell = Eº - RT/nF lnQ

Where R = 8.314,

T = 47 °C = 320.15 K

F = 96485

So we have to find E°, n and ln(Q) first.

**Step 1: Finding E° and n**

Write the semi reactions and read the E° in a potentials table:

Mg (s) ----> Mg^{+2} +
2e- E° = 2.356 V

Fe^{+2} + 2e- ----> Fe
(s) E° = -0.440

_______________________________

Mg (s) + Fe^{+2} ----> Mg^{+2} + Fe
(s) E° = 1.676 - 0.440 = 1.92 V

n is simply the number of trading electrons which is 2.

**Step 2: Find Q**

Q is defined by:

Q = [products]/[reagents] = 0.110 M / 3.10 M = 0.0355

**Step 4: Replace values**

Ecell = Eº - RT/nF lnQ = 1.92 V - [ (8.314)*(320.15) / ((2) *
(96485))] * ln(0.0355) = **1.97 V**

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Express your answer to three significant figures and include the
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[Mg2+]= 0.310 M .

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Part A:What is the value for the reaction quotient, Q,
for the cell?
Express your answer numerically.
Part B:What is the value for the temperature, T, in
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Express your answer to three significant figures and
include the appropriate units.
Part C:What is the value for n?
Express your answer as an integer and include the
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at 79 ∘C , where [Fe2+]= 3.30 M and [Mg2+]= 0.310
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Part A
What is the value for the reaction quotient, Q, for the
cell?
Part B
What is the value for the temperature, T, in
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Express your answer to three significant figures and include the
appropriate units.
Part C
What is the value for n?
Express your answer as an integer and include the appropriate
units (i.e. enter mol for moles).
Part...

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M and [Mg2+]= 0.210 M .
Part A
What is the value for the reaction quotient, Q, for the
cell?
Part B
What is the value for the temperature, T, in
kelvins?
Part C
What is the value for n?
Part D
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Part E
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V
what is the cell potential at 25 ∘C if the concentrations are
[Co3+]=...

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cell?
B. What is the value for the temperature, T, in kelvins? What is
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C. Calculate the cell potential.

Which of the following is a spontaneous reaction?
Select one:
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Fe2+ (aq) + Mg(s)
b. Pb(s) + Fe2+(aq) →
Pb2+ (aq) + Fe(s)
c. 2Na (s) + Ca2+ (aq) →
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d. Li(s) + K+(aq) → Li+
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