Question

For the following two half-cell reaction Fe3+ + e- --> Fe2+ and I3- + 2e- -->...

For the following two half-cell reaction Fe3+ + e- --> Fe2+ and I3- + 2e- --> 3 I- determine the spontaneous reaction (balanced). Must give a short reason for choice. Calculate the standard cell potential. Calculate the free energy of the reaction at standard conditions

Science   Chemistry   
0 0
Add a commentTranscribed image text
Next >

Homework Answers

Answer #1

first find the reduction potentials

Fe+3 + e- ---> Fe+2 Eo = 0.77

I3- + 2e- --> 3I- Eo = 0.53

we know that

the electrode with more reduction potential is cathode

so

iron is cathode

now

cathode : reduction

2Fe+3 + 2e ---> 2Fe+2

anode : oxidation

3I- + 2e- --> I3-

so

the balanced reaction is

3I- + 2Fe+3 ---> I3- + 2Fe+2


now

Eo cell = Eo cathode - Eo anode

Eo cell = 0.77 - 0.53

Eo cell = 0.24 V

now

dGo = - n x F x Eo

here

n =2 as two electrons are transferred

so

dGo = - 2 x 96485 x 0.24

dGo = -46313

dGo = - 46.313 kJ

0 0
Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
17. Given the following two half-cell reactions and their half-cell potentials: Fe3+ + e --> Fe2+...
17. Given the following two half-cell reactions and their half-cell potentials: Fe3+ + e --> Fe2+ Eo = 0.68 V Cr2O72- + 14H+ + 6e– --> 2 Cr3+ + 7H2O E° = 1.33 V a. Write the balanced full-cell reaction for a spontaneous reaction and determine the Eo cell ([H+ ] = 1.0 M): Balanced full-cell reaction: Eo cell: Answer: 0.65 V (How they got that?) b) What’s the equilibrium constant at room temperature ? Answer: K = 8.66 x...
Using the following standard reduction potentials, Fe3+(aq) + e- --> Fe2+ (aq) E = + 0.77...
Using the following standard reduction potentials, Fe3+(aq) + e- --> Fe2+ (aq) E = + 0.77 V Ni2+ (aq) + 2e- (aq) --> Ni(s) E = - 0.26 V Calculate the standard cell potential for the galvanic cell reaction given below and determine weather or not if the reaction is spontaneous under standard conditions. Ni2+ (aq) + 2 Fe2+ (aq) --> 2 Fe3+ (aq) + Ni(s)   SHOW ALL WORK
Combine the two half-reactions that give the spontaneous cell reaction with the smallest E∘. Fe2+(aq)+2e−→Fe(s) E∘=−0.45V...
Combine the two half-reactions that give the spontaneous cell reaction with the smallest E∘. Fe2+(aq)+2e−→Fe(s) E∘=−0.45V I2(s)+2e−→2I−(aq) E∘=0.54V Sn4+(aq)+2e−→Sn2+(aq) E∘=0.15V Write a balanced equation for the cell reaction. Express your answer as a chemical equation. Identify all of the phases in your answer.
calculate the potential of the cell: ni2+ +fe > ni+fe2+ the half reactions involved are: ni2+...
calculate the potential of the cell: ni2+ +fe > ni+fe2+ the half reactions involved are: ni2+ +2e- > ni E°=-0.26v and fe2+ +2e- > fe E°=-0.45v is the reaction spontaneous or nonspontaneous?
A chemist designs a galvanic cell that uses these two half-reactions: half-reaction standard reduction potential Cl2(g)+2e−→...
A chemist designs a galvanic cell that uses these two half-reactions: half-reaction standard reduction potential Cl2(g)+2e−→ 2Cl−(aq)   E0red = +1.359V NO−3(aq)+4H+(aq)+3e−→ NO(g)+2H2O(l)   E0red = +0.96V Answer the following questions about this cell. Write a balanced equation for the half-reaction that happens at the cathode.   Write a balanced equation for the half-reaction that happens at the anode.   Write a balanced equation for the overall reaction that powers the cell. Be sure the reaction is spontaneous as written.   Do you have enough...
4a. Use the Nernst equation to calculate the cell voltage (E) for the following redox reaction:...
4a. Use the Nernst equation to calculate the cell voltage (E) for the following redox reaction: i. Fe3+(aq)+Cu(s)→Cu2+(aq)+Fe2+(aq), given that [Fe3+]=0.05 and [[Cu2+]=0.125M at 25°C, and Fe3++e→Fe2+             E0=0.77 V Cu2+2e→Cu                   E0=0.34 V 4b. Use the information provided in question 4a to calculate the change in free energy (ΔG) and change in entropy (ΔS) for the redox reaction: i. Fe3+(aq)+Cu(s)→Cu2+(aq)+Fe2+(aq) What do the ΔG and ΔS values indicate about the spontaneity of the redox reaction?
A chemist designs a galvanic cell that uses these two half-reactions: half-reaction standard reduction potential N2(g)+4H2O(l)+4e−→...
A chemist designs a galvanic cell that uses these two half-reactions: half-reaction standard reduction potential N2(g)+4H2O(l)+4e−→ N2H4(aq)+4OH−(aq) E0red = −1.16V Zn+2(aq)+2e−→ Zn(s) E0red = −0.763V Answer the following questions about this cell. Write a balanced equation for the half-reaction that happens at the cathode.   Write a balanced equation for the half-reaction that happens at the anode.   Write a balanced equation for the overall reaction that powers the cell. Be sure the reaction is spontaneous as written.   Do you have enough...
Constants Fe2+ + 2e− = Fe(s) E º =−0.44 V; O + 4H+ + 4e− 2H2O...
Constants Fe2+ + 2e− = Fe(s) E º =−0.44 V; O + 4H+ + 4e− 2H2O E º =−1.23 V 2)In acid solution, the half cells Fe2+(aq) | Fe(s) and O2(g) | H2O are linked to create a spontaneous, galvanic cell. a) Calculate Eºcell _____________ b) Which reaction occurs at the cathode _______________________________ c) Write the overall reaction for the cell ___________________________________ d) Write the shorthand notation for the anode (anode || cathode).
A voltaic cell is constructed based on the following reaction and initial concentrations: Fe2+( F e...
A voltaic cell is constructed based on the following reaction and initial concentrations: Fe2+( F e 2 + ( 0.0045 M)+Ag+( ) + A g + ( 2.3 M M )⇌ ) ⇌ Fe3+( F e 3 + ( 0.0045 M M )+Ag(s) -Calculate [Fe2+]when the cell reaction reaches equilibrium.
Given the folloiwng two half-reactions: Fe3+ (aq) + 3 e− --> Fe (s)             E0 =...
Given the folloiwng two half-reactions: Fe3+ (aq) + 3 e− --> Fe (s)             E0 = −0.036 V Mg2+(aq) + 2 e− --> Mg (s) E0 = −2.37 V Calculate cell potential (Ecell) for a voltaic cell when [Fe3+] = 1.0 *10-3 M, [Mg2+] = 2.50 M at 25 oC Hint: (1) Write the overall redox reaction and count the number of electrons transferred; (2) determine the cell potential for a voltaic cell; (3) Calculate Q; (4) Plug in the...
ADVERTISEMENT
Need Online Homework Help?

Get Answers For Free
Most questions answered within 1 hours.

Ask a Question
ADVERTISEMENT