All are one question! They are separated by steps. Please answer all steps. Thanks!
a) The cell will comprise of the oxidation half cell (anode) and the reduction half cell (cathode). In a cell notation, the oxidation half is written followed by the reduction half separated by vertical bars (│). The vertical bars are used to denote different phases.
HI can be written as H+(aq)I- (aq). H2 is oxidized to H+ (hence forms the anode) while I2 is reduced to I- (hence forms the cathode). H2 and I2 are gases while HI is an aqueous species; hence, we shall need Pt electrodes to support the gaseous and aqueous species.
Therefore, the cell notation is
Pt│H2 (g)│H+(aq), I-(aq)│I2 (g)│Pt
b) The half reactions are shown below.
Oxidation (left): H2 (g) --------> 2 H+ (aq) + 2 e-. E0L = 0.00 V
Reduction (right): I2 (s) ------> I2 (g) + 2 e- ---------> 2 I- (aq); E0R = +0.54 V
The total cell potential is given as
E0cell = E0R + E0L = (+0.54 V) + (0.00 V) = 0.54 V (ans).
c) The equilibrium constant of the cell can be obtained by using the relation
n*F*E0cell = R*T*ln Keq where n = 2 (since 2 electrons are involved); F = 96485 J/V.mol; R = 8.314 J/mol.K and T = 298 K; therefore,
(2)*(96485 J/V.mol)*(0.54 V) = (8.314 J/mol.K)*(298 K)*ln Keq
=====> ln Keq = 42.0588
=====> Keq = exp^(42.0588) = 1.8446*1018 ≈ 1.845E18 (ans).
All are one question! They are separated by steps. Please answer all steps. Thanks! Devise a...
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