56. [1.97] Vitamin C. Some people believe that large doses of vitamin C can cure the common cold. One commercial over-the-counter product consists of 500.0 mg tablets that are 20.0% by mass vitamin C. How many tablets are needed for a 1.00-g dose of vitamin C? (Note: 20.0% by mass means that there are 20.0 grams of vitamin C for every 100 grams of tablets. As a conversion factor, you would write 20.0 g vitamin C / 100 g tablets).