3. The human body excretes nitrogen in the form of urea, NH2CONH2. The key biochemical step in urea formation is the reaction of water with arginine to produce urea and ornithine:

 (a) What is the mass percent of nitrogen in urea , arginine, and ornithine? 

(b) How many grams of nitrogen can be excreted as urea when 143.2 g of ornithine is produced?

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