5. Cocoa powder, a main ingredient of chocolate, is made by roasting ground cacao beans (note the spelling difference). Caffeine and theobromine, two organic base compounds that produce the stimulant effect in coffee and tea, are also present in the beans that are used to make cocoa powder. The Lindt "Supreme Dark" chocolate bar shown in the picture claims to be 90% cocoa. The literature reports that the concentration of caffeine in dried, mature beans is 6.4 mg/g and theobromine in dried, mature beans is 27.1 mg/g. You may assume that 1 gram of cocoa powder comes from 1 g of dried, mature bean. a. What is the total weight of caffeine and theobromine (in mg) in the 100-g bar? Lindt EXCELLENCE 90% COCOA SUPREME DARK b. Starbucks reports that the caffeine content of a 20-oz "venti" cup of Blonde Roast coffee is 475 mg. Based on your answers in part (a), how many Lindt chocolate bars would you need to eat to get the same caffeine jolt as from a Starbucks "venti" Blonde Roast?