The table shows the percentages of hydrocarbons that are found in a sample of crude oil. Hydrocarbons Percentage paraffins 30 naphthenes 49 aromatics 15 asphaltics 6. 0 Based on the given information, what is the best classification for this sample of crude oil? an element a pure compound a pure substance a mixture.

What is the number of atoms in 3.54 mol s

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.

Name the element in group 17, period 2. (periodic table)