The bond dissociation energy of H2 is 435 kJ mol1 (104 kcal mol1 ); that is, it takes this amount of energy to dissociate H2 into its atoms. Estimate the bond dissociation energy of H2 + and explain your answer.
Reference Electrode There is no way to measure reduction potential of an isolated half reaction Only the difference is potential between 2 half cells can be added In order to assign E nought red to half reactions, reference electrode chosen, where the cell potential = 0.0 V Standard H Electrode 2H++2e>H2 EH+=0.0 V reversible not at equilibrium can be oxidation or reduction Example 5: Galvanic Cell Zn/Zn2+ Zn>Zn2++2e anode 2H++2e_>H2 cathoden+2H+>Zn2++H2 Ecell= ErEo or Ecell= EcEa 0.76=0VEZn2+=0.76 EZn2+ Ered table 20.1 in the book -oxidized+e→ reduced ions elements or compounds Top to bottom down E nought red low value Ered<0, easily oxidized Value Ered=less likely to undergo reduction Sign Ered att
