In one type of Breathalyzer (alcohol meter), the quantity of ethanol in a sample is related to the amount of electric current produced by an ethanol–oxygen fuel cell. Use data from Table 19.1 and Appendix D to determine 

(a) E°_cell and 

(b) E° for the reduction of CO₂(g) to CH₃CH₂OH(g).

Table 19.1

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TABLE 19.1 Standard Reduction Potentials at 298.15 K and 1 atma Reduction Half-Cell Reaction Acidic solution F₂(g) + 2 e 2F (aq) O3(g) + 2 H¹ (aq) + 2 e O₂(g) + H₂O(1) S₂O² (aq) + 2 e 2 SO4²(aq) H,Oz(aq) + 2H*(aq) +2e <2H,O(1) Ce+ (aq) + e Ce³+ (aq) MnO4 (aq) + 4H*(aq) + 3 e¯ ⇒ MnO₂(s) + 2 H₂O(1) PbO₂ (s) + SO² (aq) + 4H+ (aq) + 2e¯ — PbSO(s) + 2 H₂O(1) Cl₂(g) + 2 e 2 CI (aq) Cr₂O7² (aq) + 14 H*(aq) + 6 e¯ — 2 Cr³+ (aq) + 7 H₂O(1) MnO2 (s) + 4H* (aq) + 2 e Mn²+ (aq) + 2 H₂O(1) O₂(g) + 4H+ (aq) + 4e 2 H₂O(1) IO3 (aq) + 12 H*(aq) + 10 e Br₂(1) 2 e 2 Br NO3(aq) + 4H(aq) + 3 e¯¯ — NO(g) + 2 H₂O(1) Ag¹(aq) + e Ag(s) Fe³+ (aq) + e Fe²+ (aq) Oz(g) +2H*(aq) +2e