Answer:
(i) (a) Calculation of standard
cell potential
(i) E0cell = E0c
? E0a
= E0Cd2+/Cd
? E0Cr3+ /Cr
= ? 0.40 ? (? 0.74) = ? 0.40 +
0.74
= + 0.34 V
(b) Calculation of
= ? nFE0
cell
= ? 6 × 96500 C × 0. 34 V
= ? 196860 J = ? 196.86 kJ/mol
(c) Calculation of equilibrium
constant
= ?2.303
RT log Kc
log Kc = 34.501
Kc = antilog (34.501)
= 3.17 × 1034
(ii) Solve in the same way (a) E0cell
= 0.03 V
(b) = ? 2.895 kJ
mol?1
(c) Kc = 3.2
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