How many moles of KBrO3 are required to prepare 0.07 moles of Br2 according to the reaction:
KB...
Chemistry, 22.05.2020 22:05 chloeholt123
How many moles of KBrO3 are required to prepare 0.07 moles of Br2 according to the reaction:
KBrO3 + KBr + HNO3 KNO3 + Br2 +H2O
a.
0.210
c.
0.0220
b.
0.0233
d.
0.0732
Answers: 1
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 17:30, kiaramccurty
What type of organic molecule comprises the majority of a potato?
Answers: 1
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