a. i. What is a fuel cell? ii. Using an example, explain how a fuel cell works. b. i. What is a concentration cell? ii. Briefly explain how a concentration cell operates iii. Calculate the E cell of the following concentrations Mg Mg(0.24M)||Mg(0.53)|Mg(s) c. Consider the oxidation of ammonia 4NH +30 2N+ 6HO i. Calculate the AG for the reaction Imk. 2.5 mks 1 mk 2.5 mks 3 mks 2 mks ii. If this reaction were used in a fuel cell what would the standard cell potential be? 2 mks