An electric current was passed through aluminium oxide and molten sodium chrolide in electrolytic cell connected in series . 4 litres of oxygen were evolved at the anode of the first electrolytic cell at stp .calculate the amount of sodium liberated at the cathode of the second electrolytic cell.

Which of the following is an example of how telecommunication devices people do their jobs? a.) a security guard checks the time using a digital watch. b.) a banker does some quick math using a solar calculator. c.) a nurse uses a digital thermometer to take a patient’s temperature. d.) a construction worker reports in to his office using a cell phone.