When copper metal is added to nitric acid, the following reaction takes place cu (s) + 4 hno₃ (aq) → cu(no₃)₂ (aq) + 2 h₂o (l) + 2 no₂ (g) calculate the volume of no₂ gas collected over water at 25.0 °c when 2.01 g of copper is added to excess nitric acid if the total pressure is 726 mm hg. the vapor pressure of water at 25.0 °c is 23.8 mm hg.
Answers: 3
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 14:00, leahstubbs
8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.
Answers: 3
When copper metal is added to nitric acid, the following reaction takes place cu (s) + 4 hno₃ (aq) →...
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