Can someone help Find the molar mass for each of the reactants and each product in this equation (ASAP) H+(aq) + HCO3-(aq) →CO2(aq) + H2O(l)

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.