Wasses Fill in the calculation triangle for changing between masses and moles. Then complete the table below. (Use the
following A values: H=1, C = 12, N = 14,0 = 16, Mg = 24, S = 32, CI = 35.5, Ca = 40, Cu = 64.)
Substance Ar or Mr number mole G
cu ? ? 128
some pls i dont understand that traingle how to fill i finded ar and mole gramm pls help me​

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.

Compare and contrast physical changes with chemical changes.

If anyone would be able to me out with these three questions it would be these are from the chem 2202 course.