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19 Nov 2019

Q.Solve question with proper exaplanation

If △G = −177 K cal for (1) 2Fe (s) +32 O2 (o) → Fe2 O3 (s)and △G = −19 K cal for (2) 4Fe2 O3 (s) + Fe(s) → 3Fe3 O4 (s)What is the Gibbs free energy of formation of Fe3 O4 ?(A) + 229.6 kcalmol (B) −242.3 kcalmol (C) −727 kcalmol (D) −229.6 kcalmol

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Collen Von
Collen VonLv2
13 Jul 2019

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Related questions

A) What is the value of K at 298K for the following reaction? (Please give your answer to two significant digits in scientific notation) K = enFE°/RT

3A2+(aq) + 2B(s)→ 2B3+(aq) + 3A(s)

A2+(aq) + 2e- → A(s) E°red = −0.45 V

B3+(aq) + 3e- → B(s) E°red = − 0.75 V

B) Using the standard reduction potentials table in your book/notes, what is the standard change in gibbs free energy for the following reaction in kJ?

2NO3-(aq) + 8H+(aq) + 3Cu(s) → 3Cu2+(aq) + 2NO(g) + 4H2O(l)

If you took CHEM 122 lab here, this was the first reaction in the cycle of copper lab that released the brown NO gas.

C) What is the cell potential for the spontaneous concentration cell with the reaction Fe3+(aq) + Fe(s) → Fe(s) + Fe3+(aq), with concentrations of Fe3+ of 0.858M and 0.328M at a temperature of 310. K?

Ecell = E°cell −(RT/nF)lnQ

D)Which of the following will decrease the cell potential for the following reaction:

2Fe3+(aq) + 3Zn(s) → 3Zn2+(aq) + 2Fe(s)

Use the reaction Ecell = E°cell − (RT/nF)lnQ and consider how each manipulation affects Q and thus affects Ecell

Dilute the entire system

Remove water from the entire system

Add solid iron to the system

Increase concentration of Fe3+ in the solution

Increase the concentration of zinc ion in solution

Add zinc solid

1) Using the standard reduction potentials table in your book/notes, what is the standard change in gibbs free energy for the following reaction in kJ?

2NO3-(aq) + 8H+(aq) + 3Cu(s) → 3Cu2+(aq) + 2NO(g) + 4H2O(l)

If you took CHEM 122 lab here, this was the first reaction in the cycle of copper lab that released the brown NO gas.

2) What is the value of K at 298K for the following reaction? (Please give your answer to two significant digits in scientific notation) K = enFE°/RT

3A2+(aq) + 2B(s)→ 2B3+(aq) + 3A(s)

A2+(aq) + 2e- → A(s) E°red = −0.58 V

B3+(aq) + 3e- → B(s) E°red = − 0.75 V

3) What is the cell potential for the spontaneous concentration cell with the reaction Fe3+(aq) + Fe(s) → Fe(s) + Fe3+(aq), with concentrations of Fe3+ of 0.848M and 0.353M at a temperature of 310. K?

Ecell = E°cell −(RT/nF)lnQ

4) Which of the following will increase the cell potential for the following reaction:

2Fe3+(aq) + 3Zn(s) → 3Zn2+(aq) + 2Fe(s)

Use the reaction Ecell = E°cell − (RT/nF)lnQ and consider how each manipulation affects Q and thus affects Ecell

- Add zinc solid

- Remove water from the entire system

- Add solid iron to the system

- Increase the concentration of zinc ion in solution

- Dilute the entire system

- Increase the concentration of Fe3+ in the solution

1)

How are the equilibrium constant and the standard cell potential of an oxidation-reduction reaction related?

a) They are not related. The equilibrium constant derives from enthalpy while reduction potential only deals with charge.
b) Both are a function of the standard change in Gibbs free energy.
c) Both are related to the amount of work that can be done by a reaction on its surroundings.

d) Both are a function of the number of electrons transferred in the reaction.

2)

Calculate the standard cell potential (E∘) for the reaction

X(s)+Y+(aq)→X+(aq)+Y(s)

if K = 2.30×10−4.

Express your answer to three significant figures and include the appropriate units.

3) Consider the reaction

Mg(s)+Fe2+(aq)→Mg2+(aq)+Fe(s)

at 77 ∘C , where [Fe2+]= 3.80 M and [Mg2+]= 0.310 M .

A)

What is the value for the temperature, T, in kelvins?

Express your answer to three significant figures and include the appropriate units.

B)

What is the value for n?

Express your answer as an integer and include the appropriate units (i.e. enter mol for moles)

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