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Chemistry, 22.06.2019 05:30
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.
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Chemistry, 22.06.2019 13:30
Apush or pull that moves or changes and object when to objects touch
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Chemistry, 22.06.2019 22:10
What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added
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Chemistry, 23.06.2019 01:00
Reactions in cells take place at about a. 40°c b. 0° c. 100°c d. 60°c
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Air at 37.8 °c and 101.3 kpa absolute pressure flows at a velocity of 23 m/s past a sphere having a...
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