Chemistry, 28.08.2020 02:01 mpete1234567890
A certain solution has a molarity of M = 3.14 mol/L and has a volume of V = 0.760 L . What is the value of n? Express your answer numerically in moles.
Answers: 2
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
Chemistry, 22.06.2019 21:00
Once similarity and one difference between a mixture of elements and a mixture of compounds
Answers: 3
Chemistry, 22.06.2019 22:00
The volume of an unknown substance in a sealed glass jar is 50 milliliters. the volume of the jar is 200 milliliters. which state of matter could the substance be?
Answers: 2
A certain solution has a molarity of M = 3.14 mol/L and has a volume of V = 0.760 L . What is the va...
Biology, 17.11.2020 01:30
Mathematics, 17.11.2020 01:30
Spanish, 17.11.2020 01:30
Business, 17.11.2020 01:30
Mathematics, 17.11.2020 01:30
Physics, 17.11.2020 01:30
Geography, 17.11.2020 01:30
Mathematics, 17.11.2020 01:30
Social Studies, 17.11.2020 01:30
Mathematics, 17.11.2020 01:30
Mathematics, 17.11.2020 01:30
Health, 17.11.2020 01:30
Mathematics, 17.11.2020 01:30