Chemistry, 17.10.2021 07:40 simonthang8
Cho 52,5 gam hỗn hợp 2 muối cacbonat của 2 kim loại X và Y ở nhóm IA phản ứng với dung dịch H2SO4 dư thu được dung dịch A. Cô cạn A thu được 68,7 gam muối khan. Xác định tên của X và Y
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 19:00, ecolifesfsu1263
What is the compound name for the formula [ru(en)2cl2]2+ and [co(en)cl2br]-
Answers: 1
Chemistry, 23.06.2019 02:20, theactualslash
In a chemical reaction, the final amount of the products is determined by the a. universal gas law b. law of definite proportions c. air pressure d. temperature e. none of the above me
Answers: 2
Cho 52,5 gam hỗn hợp 2 muối cacbonat của 2 kim loại X và Y ở nhóm IA phản ứng với dung dịch H2SO4...
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