Chemistry, 11.02.2020 18:52 DoomydoomGir
How much MnO 2 ( s ) should be added to excess HCl ( aq ) to obtain 395 mL Cl 2 ( g ) at 25 °C and 785 Torr ?
Answers: 3
Chemistry, 22.06.2019 00:00
Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.
Answers: 1
Chemistry, 22.06.2019 04:00
Which of the following ocean acidification? are the most likely side effects of a ph less than 7.0 in the ocean b. more metal salts altering the ocean chemistry c. dissolution of the shells of marine organisms d. both a & b e. all of the above.
Answers: 3
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.
Answers: 1
How much MnO 2 ( s ) should be added to excess HCl ( aq ) to obtain 395 mL Cl 2 ( g ) at 25 °C and 7...
Mathematics, 06.01.2021 21:40
Mathematics, 06.01.2021 21:40
Social Studies, 06.01.2021 21:40
Health, 06.01.2021 21:40
Mathematics, 06.01.2021 21:40
Mathematics, 06.01.2021 21:40
English, 06.01.2021 21:40
Social Studies, 06.01.2021 21:40