Which of the following reactions will occur spontaneously as written? Show your

Question

Which of the following reactions will occur spontaneously as written? Show your work. 3Fe^2+ (ag) + Cr^3+ (ag) rightarrow Cr (s) + 3Fe^3+ (ag) 2Cr^3+ (ag) + 3Sn^2+ (ag) rightarrow 3Sn^4+ (ag) + 2Cr(s) Sn^4+ (ag) + Fe^2+ (s) rightarrow Sn^2+ (ag) + Fe (s) Sn^2+ (ag) + Fe^2+ (s) rightarrow Sn64+ (ag) + Fe^3+ (ag) 2Cr (s) + 3Fe^2+ (s) rightarrow 3Fe (s) + 2Cr^3+ (ag) The standard cell potential (E^ degree cell) of the reaction below is -0.55 V. The value of Delta G degree for the reaction is J/mol. I2 (s) + 2Br^- (ag) rightarrow 2I^- (ag) + Br2 (I)

Explanation / Answer

5.

A reaction, as written, is spontaneous at STP if Eocell >0

Eocell = Eocathode + Eoanode

(consider cathode the half reaction, as written, where the reduction occurs).

A.

Eocell = - 0.74V – 0.771V = - 1.511 V

B.

Eocell = - 0.74 V – 0.154 V = - 0.894 V

C. wrong equation; both half reactions are reduction

D. wrong equation; both half reactions are oxidation

E.

Eocell = -0.440 V + 0.74 V = 0.30 V (spontaneous)  

                                                                                     

6. dG0 = -nF Eocell = - 2x96500Cx(-0.55V)= + 106150 J = 106 kJ

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