In 2010, the first bus with non-polluting technology, 100% national, running on a fuel cell, was launched in Rio de Jane

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In 2010 The First Bus With Non Polluting Technology 100 National Running On A Fuel Cell Was Launched In Rio De Jane 1 (66.39 KiB) Viewed 11 times

In 2010, the first bus with non-polluting technology, 100% national, running on a fuel cell, was launched in Rio de Janeiro. This technology uses oxygen from the air and hydrogen stored in cylinders. The standard reduction potentials of the half-reactions at 25°C are shown below. O2(g) + 4H*(aq) + 4e → 2H2O(1) 2H(aq) + 2e H2(g) E° = + 1,229 V E = 0,000 V a. Write the half-reactions that occur at the cathode and anode and the overall reaction of the galvanic cell. b. Calculate the value of the equilibrium constant, K, for the reaction in the galvanic cell at 25 °C. C. Calculate the change in potential of the galvanic cell,A E, at 90 °C, knowing that air (1 atm) is 20% O2 by volume, and that the pressure of H2 is controlled to react completely with the 02. Assume that AE° does not vary significantly with temperature. Dados: F = 96500 C molt R = 8,3145 J mol''K Gabarito: a) Catodo: O2(g) + 4H*(aq) + 4e → 2H 0(1) Anodo: H2(g) → 2H+ (aq) + 2e (x2) Reação global: O2(g) + 2H2(g) → 2H2O(1) b) 1 x 10 c) 1,202 v