The average CT scan exposes a patient to an average of 20 mSv. How many CT scans would a person have to go through to be as close as possible to the amount of radiation emergency workers are limited to receiving in a life-saving situation? plz help me

Match each term to its description. match term definition excess reactant a) reactant that can produce a lesser amount of the product limiting reactant b) amount of product predicted to be produced by the given reactants theoretical yield c) reactant that can produce more of the product