An element is made up of three isotopes, one of which (Bºx has a % abundance of 3.09%, while the other two are unknown. If the mass of the three isotopes are 28X(mass = 27.9769), X(mass = 28.9765) and
30x(mass = 29.9738), and the atomic weight of the element is 28.0855 amu, what are the % abundances of
the other two isotopes?

The first element on the periodic table of elements is carbon. a. true b. false

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.

What is the mass of 0.46 mil of mgcl2