On Crosbia, the element unobtanium (Uo) has three isotopic forms: Uo-220, U0-221, and Uo- 224. The natural abundance is 32.32 % U0-220, and 47.18 % U0-224. What atomic mass would
be displayed for Uo? Assume the mass of Uo-220 is 220.0 amu, Uo-221 is 221.0 amu, and the
mass of U0-224 is 224.0 amu.

A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.