Chemistry, 25.11.2021 05:10, esekvng1596
what is the vapour pressure at 298K of a 20% solution of KNO3 by mass. Vapour pressure of water at 298K is 3.2kPa
Answers: 3
Chemistry, 21.06.2019 17:00, alevans7144
Why do sodium and neon have vastly different chemical and physical properties despite having similar atomic masses?
Answers: 2
Chemistry, 22.06.2019 05:30, MansellS5529
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.
Answers: 1
what is the vapour pressure at 298K of a 20% solution of KNO3 by mass. Vapour pressure of water at 2...
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