Ideas from Chapters 16 to

9 Oxalic acid, an organic compound found in plants and vegetables such as rhubarb, has a mass percent composition of 26.7% C, 2.24% H, and 71.1% 0. Oxalic acid can interfere with respiration and cause kidney or bladder stones. If a large quantity of rhubarb leaves is ingested, the oxalic acid can be toxic. The lethal dose (LD50) in rats for oxalic acid is 375 mg/kg. Rhubarb leaves contain about 0.5% by mass of oxalic add. (2.7,7.4,7.5) 

ll Tamiflu (Oseltamivir), C16H28N2O4, is a drug that is used to treat influenza. The preparation of Tamiflu begins with the extraction of shikimic add from the seedpods of the Chinese spice, star anise. From 2.6 g of star anise, 0.13 g of shikimic acid can be obtained and used to produce one capsule containing 75 mg of Tamiflu. The usual adult dosage for treatment of influenza is 75 mg of Tamiflu twice daily for 5 days. (2.7, 6.5,7.2,7.3,7.4,7.5) 

The spice called star anise is a plant source of shikimic acid. 

What is the molecular formula of shikimic acid (Black spheres are carbon, white spheres are hydrogen, and red spheres are oxygen.) 

How many moles of shikimic acid are contained in 1.3 g of shikimic acid  

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The interchapter problem set. Combining Ideas from Chapters 1 to 3, completes the chapter. 

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