Beginning with the absorbance of your unknown brass sample show computation for a) Cu+(2) (aq) concentration; b) mass of Cu in brass; c) percent Cu in brass, d) the average percent Cu in brass. Include computation for each trial and average when mass of brass is .725g and absorbance is .456 (nm) for first trial as well as for second trial mass of brass is .725g and absorbance is .525(nm)