Question

In: Chemistry

Could you please answer this? The reaction of Cr3+(aq) and Cr(s) to form Cr2+(aq). [The reduction...

Could you please answer this?

The reaction of Cr3+(aq) and Cr(s) to form Cr2+(aq). [The reduction potential of Cr2+(aq)to Cr(s) is -0.91 V.]

Calculate ΔG∘rxn.

Calculate K

Expert Solution

Cr^3+(aq) + Cr(s) ---------------------> Cr^2+ (aq)

Cr(s) ----------------------> Cr^2+ (aq) + 2e^+ E0 = 0.91v

2Cr^3+ (aq) + 2e^- -----------> 2Cr^2+ (aq) E0 = -0.407v

-----------------------------------------------------------------------------------------

2Cr^3+(aq) + Cr(s) ---------------------> 3Cr^2+ (aq) Ecell = 0.503v

n = 2

G⁰ = -nE0cell *F

= -2*0.503*96500

= -97079J

G⁰ = -RTlnK

-97079 = -8.314*298*2.303logK

-97079 = -5705.8483logK

logK = -97079/-5705.8483

logK = 17

K = 10^17 = 1*10^17 >>>>answer

queen_honey_blossom answered 2 years ago

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