we are asked in the problem to determine the number of servings of grapefruit to produce 75 mg of vitamin C. According to studies, the vitamin C content of grapefruit is 31.2 mg per 100 g fruit. using stoichiometry, we write
75 mg vitamin C * (100 g grapefruit)/31.2 mg Vitamin C = 240.39 g grapefruit. this is equivalent to about 2 small sized grapefruits.
