Barbara is converting 78 f to degrees celsius. first, she subtracts 32 from 78.what is the next step ? a. multiply 46 by 5/9 b. multiply 46 by 9/5 c. add 273 to 46 d. subtract 273 from 46

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.

If two atoms are bonded to a central atom with no lone pairs,how will they be arranged

How many moles of potassium hydroxide are needed to completely react with 2.94 moles of aluminum sulfate