Urea makes up a significant amount of urine, and is the chemical that the body uses to rid cells of unwanted carbon dioxide and nitrogen. the chemical formula is as follows: nh2-co-nh2. how many water molecules could hydrogen bond to urea?

Achemistry student weighs out 0.306 g of citric acid (h3c6h5o7), a triprotic acid, into a 250 ml volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with 0.1000 m naoh solution. calculate the volume of naoh solution the student will need to add to reach the final equivalence point. be sure your answer has the correct number of significant digits.