Stare diffusion and reaction. solute a is diffusing at unsteady state into a semi-infinite medium of pure b and undergoes a first-order reaction with b. sol- ute a is dilute. calculate the concentration cat points z = 0.4, and 10 mm from the surface for 1 x 10's physical property data are d. 1 x 10 ml = 1 x 10 cx0 = 10 kg molím'. also calculate the kg mol absorbed/m.

Which of the following best describes the formation of plasma?

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

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.