1. Determine the energy density of the sin electrode which is measured as energy in kJ that can be obtained from the 1 kg of the metal?
2. Suppose the temperature is 25degrees Celsius and a partial pressure of oxygen is the 0.21 atm. If a current of 2.1 * 10^5 A is to be drawn from a zinc-air system, what volume of the air would require to be supplied to the battery every second?