Question

Use standard reduction potentials to calculate the standard free energy change (ΔGº) for the reaction below at 25º.

Report your answer in kilojoules. 2 Cr+3 (aq) + 3 Co (s) ⟶ 2 Cr (s) + 3 Co+2 (aq)

Answer 1

we know, E co2r (ar) leo(s) - 0.28v E 3+ (ar) / er(s) = -0.74 v 2er 3t can) + 300 (3) 2er(s) + 3 co?t (ar) L reduction 1 oxidation -- x2 cell is co(s) I co?" (aq) 11 er 3+ (ar) (er(s) oxidation half cellox - cols) colt cand the n0x3 reduction halt eellrx n ) cr3t+ 3e y esis) 6x3 + (11) 2 we get, 30015) – 3007 (ar) + 6e . 2 cr3t+6e - 2 ercs). overaud oth 300(s) & res 34 (ar) 2eris) & 300 + (aq) Eden - Eerstler - Ecortico = – 0.74-(-0.28) = -0.46 v oa = nF Eden = - 6x 96500 + - 0.46 - 266 340 J - 266.34 kJ According to given reaction teen value is negadive so reaction is non spontneous. And oho value is = 266.34K J.