Chemistry, 17.11.2019 18:31, jordandabrat
What is the molarity of a solution of 14.0 g nh4br in enough h20 to make 150 ml of solution?
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
Chemistry, 22.06.2019 11:30, chelseychew32
What is the main reason why some developing countries fear the increase the free trade policies around the world?
Answers: 2
Chemistry, 22.06.2019 13:00, taylorpayne525p8qxky
What is the mass of 2.00 l of an intravenous glucose solution with a density of 1.15 g/ml?
Answers: 2
Chemistry, 22.06.2019 15:00, tcapele252
‘which reaction would most likely require the use of an inert electrode?
Answers: 1
What is the molarity of a solution of 14.0 g nh4br in enough h20 to make 150 ml of solution?...
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