Read an authoritative source for a discussion of spectrophotometry. Briefly explain why it is necessary to dissolve the metal samples in a fume hood or near a vent. A student, determining the percent copper in a brass sample following the procedure described in this experiment, did the determination in duplicate. The data for each determination are ________.(1) For each determination, convert the percent transmittances to equivalent absorbances. (2) For each determination, calculate the number of grams of copper in the brass sample. (3) For each determination, calculate the percent copper in the brass sample. (4) Calculate the mean percent copper in the brass sample. (5) After performing the above determinations, the student learned from the laboratory instructor that the brass sample actually contained 56.4