If 40.0 grams of magnesium is reacted with an excess of nitric acid, HNO3, how many grams of hydrogen gas will be produced?

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.