what mass, in grams, of KClO3 is consumed when 38 grams of O2 is produced according to the following rxn: KClO3= O2+ KCl? What do I do to solve it don't give an answer just the equation or explain how to solve it

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.